First thank you all for input, recommendations,considerations, I appreciate it very much.
20 or so yrs ago I loaded 10mm to 178 PF using 200 gr RN, USPSA major was 175 at that time. I was shooting 45 acp frequently out of a 1911, Para (200 gr SWC), G21 gen2 (225 TC) and a S&W 625 230RN all around 178 PF. The semi autos were using reduce power springs including the G20. When shooting the G20 I was thinking this doesn't seem right, The G20 shot softer. I've wanting to get back to that project for quite some time. Allot of new stuff has came out since. If is better, smarter to do this project on a Gen 3 or newer I'm not wanting to waste time and money my Gen 2. If Gen 2 is good or has some benifit, I,m happy to go with that! I had heard of a SF frame but didn't think of it and never had my hands on one. I've held a G40, that is Gen4 it felt good, My Gen 2 doesn't feel bad. Seems like I had heard (several years ago) the Gen 4 doesn't modify well or something to that nature. Again thank you all for the input.