Havent read through all of these but a few things to try...

Definitely get a neck cradle, this will help. Also, mix cayenne pepper with vaseline and smother it ALL over the surface of the bandage. Obviously not touching skin. This really does deter them well. If I have one that is especially bad about chewing them, I put a layer of duct tape sheet over the front of the bandage (not encircling the leg) then the spicy vaseline on top. I don't love having to do this because the duct tape traps heat within the bandage a little more, but for those really bad ones that keep chewing them off it works well. 

Horses have a very unique protective cell growth called granulated flesh and once it grows above skin level it is known as proud flesh and will turn into a gristle if you don't use something like caustic powder (wonder dust) and hydro therapy to control it before it becomes proud flesh.  A pink watery fluid is normal when water spraying.. this also increases the blood flow for faster healing. 

Granulated flesh is Mother Nature's method of protecting from getting trash in a wound or surrounding a thorn or debris to help limit infections.  The wounds should not be wrapped due to creating a warm moist dirty bacteria ridden infection.  Air and sunshine are the best sterilizers in the world .. 

By wrapping you are hindering the healing process.  To stop him from chewing on his UNWRAPPED wounds .. smear some ichthammol drawing salve close to the wound areas and the smell or taste will stop his chewing.   His pulling bandages off is a game and/or itching .. 

IMO >>>> VETERICYN is a miracle healer .. spray directly on wounds 2-3 times a day or as often as you want to ...  NO WRAPS .. you can use hydro therapy as a plus ..  pat excess water off and spray on Vetericyn ..  you will be amazed at the fast healing time with no fear of creating a worse situation with wounds wrapped.  

Due to your description of multiple wounds .. buy you 4 bottles to be used in the first month and watch the healing magic happen.  Oh.. yes.. no itching, stinging or messy grease  or changing wraps ..  you ain't gonna believe it until you see the affects it has ... tun horse out and let the air and sun help the healing process   https://www.amazon.com/Vetericyn-Plus-Animal-Wound-Spray/dp/B002YHL844/ref=pd_sim_199_1/145-9629185-2372654?_encoding=UTF8&pd_rd_i=B00425DZTM&pd_rd_r=0f1f2768-e7b2-4177-bcbe-0e94bb06b5d8&pd_rd_w=FQ31l&pd_rd_wg=DsKH7&pf_rd_p=90485860-83e9-4fd9-b838-b28a9b7fda30&pf_rd_r=9RTNPS22W3VG70NFFZK6&refRID=9RTNPS22W3VG70NFFZK6&th=1 

Just thought I would update those who recommended things I have been using Underwoods several times a day. I stopped wrapping about 6 days ago succesfully without him swelling/stocking up so I haven't wrapped since. Super happy with his progress! Cannot believe how fast he is healing. Thanks everyone for your input =)

Looks alot better, I think after a certain time of wraping its good to leave the bandage off to let the air help with the healing.. You're doing a good job .  I had a gelding go threw a fence and riped up his knee and severed his extensor tendon, what a horrible mess after months and months of wraping with splint I got to finally leave the bandages off for awhile and man the healing speeded up when the air could hit it. 

Wahhooo.... Looks great.... Another great Underwood's story...  I hope he contiues to heal.  So happy for you..

I second using the squeeze bottle to "puff on" the baking powder over the Underwoods.  These wounds do look like the perfect candidates for Underwoods.  Best of luck getting him healed up!

Edit:  I just saw your updated pictures...  Great job!  He's looking fantastic!!!

I like the underwoods but I do use the baking powder. It works best unwrapped and done several times a day. However, in my experience it's not the best on injuries below the knee. I had a horse kick through a fence.  I've been using iodine wound spray and sugar and that has been awesome for keeping the swelling down( because its osmotic) and promoting vascularization. Sugar is great too because it does not allow bacteria to grow (that's why sugar never goes bad) and its granulated so it works as a bit of an exfoliant in the wound. Honey works well too but it's quite a bit more expensive.  I've done daily dressing changes with her. My system is diapers with the elastics removed and duct taped together. Then cotton batting. Brown gauze, ace wrap  with velcro on both ends then vet wrap. Benefits of the ace wrap is it's cheap, you can get good firm pressure without getting too tight. Its washable and reusable. And best part! The vet wrap unwraps right back off of it. I was dreading cutting the bandages off everday but using the ace and the vet wrap that's not needed. My horse did some chewing on it but it held up pretty good and I just toss the ace wraps when they are junk. I got 50 rolls for $35. I think they are medline ace wraps. I got them from a website I found on amazon.

The same horse as my previous post when she was a weanling.  We used underwoods and baking powder only. The last pic was Aug 22. This was 2017. Yes, shes accident prone....

You can say that again!!!   Poor girl 

Would love to see Updated Pictures...  Little_bug  Hope your horse is healing well... 

I have also used Lime Dust on wounds like that.  Had a mare that ripped her shoulder open and had the hide peeling off as the stitches did not hold.  Started putting lime dust on it and it healed and the only scar she had was under her breast collor.

Ditto to all of that!

I actually just snapped this photo yesterday to show a friend. Not the best photo but the results are better than I ever expected. He is sound and back to being worked!

Awesome... looks great... I'm glad everything worked out for you and him..