The least recoil you can get on an AR15 has been shown by the 3gunners and similar gamers for years. You want the longest gas system you can get (generally rifle gas on a 16-18in barrel, but 20in is fine). You then add an adjustable gas block from Superlative Arms or SLR Rifleworks. Then add a rifle buffer system, with the lightest spring and buffer you can, and the lightest BCG you can. Right now this would be Taccom, Taccom, and Master of Arms (not cheap, AIM Surplus has a cheap option). You then add a stupidly loud brake like the SJC Titan, and you now own an AR with the least recoil it can possibly have. Of course you can always add more weight as well (like heavy stock and handguards) but that makes the rifle less usable for anything but a bench gun.
For your specific circumstances, I'd suggest getting rid of the SCS and using TACCOM instead and seeing how that feels, preferably in a rifle buffer system.