this thread needs to be cleaned up a bit i rekon.
what you have just done is REDUCE the boost. the solenoid increases the boost from 5psi to 7psi. without it, its just your stock actuator controlling boost (set to 5psi on r33's) you see 7psi because you have a full exhaust which adds bout 2psi to what you had before. you should be seeing 9psi with this mod. now if you were to replace the actuator you have with an r32 item, then 10psi all day everyday is yours to play with.
so earthed (7psi), earthed to cpu (5->7psi) and open circuit (5psi)? why?
anyway i had a thought on the way home. instead of a separate switch, has anyone thought of tapping into the snow/power button on autos? stock on snow and normal modes, and 7psi on power. im guessing you'd need some kinda relay setup