I've always wanted to try removing that buffer ring from a USPc/P2000/P30/HK45 to see how much difference it actually makes.
The buffer doesn't really mitigate recoil, the hard plastic doesn't compress.
The H&K buffer is to prevent over compression of the recoil spring and help keep the recoil spring from kinking or binding at full compression.
You are killing us ... we want to know how the splits are (or feel) compared to what you are shooting now?
It feels like a P30 with a trigger on par with or better than an Apex equipped M&P. As for my performance, I haven't ran it on a clock but for static shooting, it is easier to run than my P30. I can get away with more trigger press slop.