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How much heavier a buffer and which spring?
I dunno if I'll ever lap the receiver face or locktite the barrel, but cutting recoil is something I'm interested in.
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Every stock setup... rifle length, DPMS pattern carbine, and Vltor / Armalite carbine length, all use Tubbs .308 Flatwire recoils springs ( and my 9MM PCC Colt pattern )
Rifle length stocks run a KAK 308 9.3oz buffer, DPMS Pattern carbine stocks run KAK 308 2.75" 5.3oz buffers, and "Vltor / Armalite" pattern carbine length buffer tubes run 5.4oz
YMMV, since I am using SLR Adj. GB's , and Lantac muzzle brakes on all my .308 and 6.5CM Large frames.... along with various polishing / burnishing ( interior of the buffer tubes, feed ramps... etc. )
All of them shoot very softly, and every single person that has tried them comment on how soft the recoil impulse is.
Personally, I believe there is ample gas on Large Frame AR's... and the heavy recoil weights and limited gas flow tend to support that for me.... keep it lubed and let it run.