Reliably ?, I would GUESS around 17/18psi.
The T3 was never designed to boost much more than they do std, as they do not ahve a 360 bearing or step gap seal, they are a double overhang design, good for what it is but not ace with more expected from it.
With 360 bearing 25/28psi all day long.
Comp has nothing to do with lag, rpm dictates this, a ROLLER BEARING will have virtually ZERO lag, due to it not having so much friction to overcome.
There is no magic potion to prevent detonation.
The biggest consideration to CR is the effeciency of the engine.
Another consideration is the ADIABATIC effeciency of the i/cooler, basically the cooler you can keep the charge the more igntion you can run, all things being equal.
tabetha