Yeah i know what you mean on the revo stage 1, very punch with the higher than stage 2 requested down low.
Profec is very easy install and use just requires a vac feed for boost readings and +ve and -ve to the unit which feeds the solenoid which replaces the n75.
Options are,
Set gain or set boost (wg duty shown in %),
gain (boost consistancy, never really understood this as it seems to make no difference),
start boost(when the unit takes control of the WG),
warning(whatever boost you want a warning at)
limiter(used to lower boost when exceeds the limiter).
Alsi hi/low settings which you can switch on the fly is nice.
My settings are:
Set gain: 83%
Gain: 5% (lowest it will go)
Start Boost: 14.5psi
Warning: 23psi
Limiter 4%
Seems to run very nice with this indeed, any higher start boost and its spikes to high early on and surges. Could run more than 83% really.