I think the brick wall you are talking about is the snipers bolt o rings rubbing along the detent
Bingo, take the front o ring off, keep the rear one.
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I had allmost a 30 fps drop in velocity when taking the front (3rd) oring off the stock bolt and had trouble getting up to velocity with the checkit bolt ( no front oring) without turning the ivg way in. Its a little smoother pump stroke, but I dont think worth the compromise of the the smoother shot ( Ivg not turned in so far) and efficiency of running without the front oring. I am using the TechT hush bolt (less drag on the detents) and its kind of the best of both worlds.