Any experts here that can give a basic limited summary of the different saddles trees for Roo? FBN6, FBN7. . 8, 9, 10?? I know the FBN6 is the most "common" one that fits most horses, but I'm having a heck of a time.  My horse has really big shoulders .  

Yes, Ive called the company to speak to Brian. I have texted him too. But I know hes super busy and traveling.

Thanks for your time. 

I'm not ordering a saddle from a maker who doesn't have time to talk to me.