ok. Hi guys.
Strength bonuses are (IMO) screwed when applying damage bonuses to special attacks. There's an extensive and detailed post breaking down the way it's applied on the silky venom defensive fighters forum (
http://www.silkyvenom.com/forums/showthread.php?t=15788 ) but it appears taht the effect is vastly more pronounced for monks than it is for other fighters given the reliance on critical hits for total DPS.
What happens is that for specials that use weapon damage and multiplicitive modifiers to calculate damage (say when you crit) those damage numbers are being caluculated and THEN the str. bonus is being tagged onto the end. I think it makes MUCH more sense to add str. bonuses as a part of base weapon damage and thus avoid scaling problems with strength at higher levels.
HUH?
So what this means is that your autotattack damage will scale appropriately as str. and level increases because there are no mulitiplicative effects to diminsh str. But as you gain more and more powerful special attacks and weapons your str. bonuses will become less and less a factor in overall DPS for critical hits.