What's your total boost vs. primary boost vs. drive pressure readings? what kind of waste gate(s) are you using? Are you blowing tons of smoke at 30 lbs/1250*? What's your custom plate look like? My hunch is, with an agressive plate and the 191 valves, you may be pushing way more fuel than necessary, at least as compared to the air being pushed through. Need more info before anyone can provide meaningful suggestions.
I'm still tuning my PDR 40/3B set up. I haven't had a problem with excessive EGTs, but I'm still working on getting the boost up. Tuning the external waste gate on the manifold is helping.
-Jay