After the 1-4-28, what is best for maintenace? 

I am doing every four weeks now that I have finished the 7 doses.  I had one horse that I would do the 7 doses twice a year and no in between.  For me it depended on the horse.

Full 1-4-28 2x a year. I use polyglucan inbetweem on the weeks they run but no more than 2x a month. Most of the time, just monthly. 

Do the 1 dose every 4 days, 7 times twice per year (early spring and fall) slip the monthly shot . It's not likely the monthly shot after the loading dose does any good. 

I do once a month for maintenance and then once in the week before a show. With how little I've shown the past two years it's worked out that they've gotten an extra 3 or 4 shots through the year. If I was showing full time again (hopefully in 2021!!) I would probably go with two shots per month during the show season.

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Adequan reserch has shown maintence dose does no good.