I use a 17LB spring in my old Transitional and it does well. Went to this a while back to ignite the Kadet 22 kit. So, I switched to this. I am a bit surptoised that I have felt no real difference from the stock spring in my 'new' 88 preB. This one felt like it had a BUNCH of potential but it is stubborn. I carefully polished the parts to include the frame as stated, and it is not smoothing out well. 3/4 of the way back I get some real grit/stacking and I think it is the frame. I may just dry fire and shoot it a bunch, then go back in. Removing and replacing the Preb safety can be high adventure. Too many times to the trough could end in a lost detent/spring. (Although I was able to convert my transitional to a B safety and have a spare assembly for that day).
Eventually this one will get Cerakote, so I may wait till then. It needs more rounds to properly break in.