Agree and disagree!
Your right on being a tinkerer.
Your not right regarding the amount of sear engagement!
It is hard to illustrate. It is the angle they are paired together in relation to their pivots.
You want an angle that once the finger moves the mechanism, in others words, overcomes the spring holding the sears together the two sear aid flying apart.
Creep is the demonstration of them resisting flying apart, not because of spring weight or even a poor finish. It is due to a camping action against one another!
Very rarely should sear engagement be lessoned!!
A very simple t