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Mine is only hooked up with boost, the hose goes straight from the turbo housing to the top of the IP.

Are you saying that you have no vacuum hooked up at all? Did yours come from the factory with all the hoses and solenoids?
My boost hose has a "T" in it for a boost gauge. Other than that, the boost side is stock. If I hook the vacuum up with the solenoid in play, it removes vac (and extra fuel) just about the time the turbo spools up.

All Diesel Fleet:
1985 Mitsubishi 2.3 Turbodiesel Pick-up, 1983 GMC Van- 6.2 Diesel.
Benzs: 1995 E300 diesel, 1980 300SD, 1982 300CD, 1983 300D, 1985 190D.
1980 AMC Eagle Limited Wagon powered by: 3.6 Litre I6 VM Turbo Diesel Engine (one of fewer than 10 made, only 2 known to still exist)