I'm not experienced with a 3 in 1911 at all.The reason is from multiple sources I have been told when you go shorter than Commander length,the "window of operation" gets smaller.
JMB designed in a choreographed dance in the 1911 which involves timing.
I can't find the whole article right now,but Bill Wilson wrote one on short barreled 1911's.I do have a link to part of the article
http://www.thetruthaboutguns.com/2014/02/robert-farago/bill-wilson-compact-1911s-can-reliable/
I do recall he recommended 185 gr bullets.
You have one less locking lug slide to barrel,I believe. Between that and a lighter slide,and an alloy frame,I suggest moderate loads and lighter bullets.
The lighter slide has higher velocity and a little less stroke.This gives your magazine less time to raise a round.
No,I'm not trashing your handgun. I'm saying it demands everything be in tune. A strong hammer mainspring will slow the slide,and a square cornered firing pin stop will also enhance using the hammer to slow the slide....in balance,the hammer pin in the aluminum frame takes more load.
A weak mag spring will be a problem. Keep those up,too. And lighter bullets lift a bit easier.
Its good to think of the recoil forces hitting your aluminum frame,but they are more robust than the slide stop holes in the aluminum frame that take the impact from the recoil spring flinging the slide.
So,IMO,stay with a moderate recoil spring ( In larger steel pistols,I don't generally exceed 18 lb) and then load to the spring.
How many rounds to change springs? I just don't know.Wild guess? 3000 rds,but its just a guess.