The 22# sounds pretty stiff, how far does it eject the spent brass? On the compact/SD 356 they used the same dual spring setup as the 40/45TSW compacts, which come out around the same 17# as used in the full size 3566. I would think that the 20# in the compact would be enough, but if you could get the smaller rod/bushing upgrade that S&W was putting in the earlier 4013/4513 that use the dual spring setup it would probably work the best. The dual springs are not available from Wolff, but the outer is the same as a 6906 which would give you some operating range. The barrel hood width is the main differance on the barrels, .260"vs.390".