TT-33 FC 'tuning'

I've got a nice Polish Tok, and a beater , and a Chinese / Norico.
The beater has a lighter, dare I say 'crisper' release than the other two. While cleaning it up a while back I took the FC package out of the nicer gun, laid them both under my magnifying light for a comparative look. The faces on the 1/2 and full cock notches are identical in angle and apparent 'finish' , so neither appear to have been worked on (stoned, etc). Could anyone weigh in on the posible range of spring weights ?
The fire control group is nice and compact, but those stubby leaf springs have kept me out of there.

BTW ... I'm still looking for a replacement barrel bushing.

Thanks in advance. Good, bad, or ugly.