Im pretty sure that if you keep stressing you a/c it gets weaker ingame...
I'm pretty sure it doesn't. I routinely stress a couple planes doing certain maneuvers, and it always happens at the same point regardless of how shot up I am/how many times I do them on a sortie. The specific quotes I've seen from HTC were with regard to control surfaces, but the impression I'd gotten was the same logic applies to things like wings.
I personally wouldn't want the 3 warnings then it goes. It should be preceded by the stress noise at a lower G point, then break if you pull too far.
Wiley.