Not knowing a lot about how you shoot, I'd guess that if your 442 DA pull is on the light side, the long and light pull keeps you applying consistent backwards pressure and not jerking.
On an autoloader, a heavier DA pull might cause you to yank, and shorter SA pulls might have you slapping the trigger to go to fast.
What I think this probably shows you is that you can have good trigger control and excellent results; you probably just need to dry fire with those other guns to get there. The 442 would seem to fit your 'default' shooting style, but that doesn't mean you can't practice to the point of getting the same results with another.
If your SIG is a DAO or DAK with a long, relatively light pull, then I am at a loss, because that ought to be fairly close to your 442 trigger. Maybe you should try a DAO or DAK SIG to see if you adjust to that more quickly, though.