For top end mass flow through the hot side your best bet is to try to keep the exhaust gas as hot as possible to bump up the choke flow point as high as you can. That might mean leaning things out a bit, or playing with ignition timing.
It's really hard to speculate without any hard data. I triggered my pre-compressor injection strictly off of manifold pressure.
On my second generation setup I was going to use both an RPM window switch and the MAP to do it so I was sure mixture speed in the inlet tract was maxed out before I started the pre-compressor injection.
If you have a simple means to do it, a mass air flow sensor input would probably be ideal as it would self adjust for rpm and boost and all those other variables.
Larry
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