You're right about needing a few sleeps to sort this out; I feel the same way. That's why I was asking about your charge air temps, and the location of your boost sensor.
IMO, if you're seeing 25psi "in" the manifold, then the motor is making the power. It's just being lost again in the belt drive for the SC.
That is unless something has changed in the exhaust system since you made your TT dynos, or the ambient temp has changed dramatically, etc.?
Is it possible you have more exhaust restriction now, or smaller A/R turbines, waste gates set higher, etc?
Any idea what the boost was post turbos, but presupercharger?