I would expect the VCV to 'leak' as you describe. Basically the VCV is a 'Variable Leak' to alter the vac to the modulator.

Its possible you may have an issue with the Vac Amp....

I have no experience of the Vac. Amp, (Never had one...) maybe a member who knows them can shed some light....

Might be worth just connecting the trans. line direct to the VCV and see what differences in operation are...

__________________
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Alastair AKA H.C.II South Wales, U.K. based member

W123, 1985 300TD Wagon, 256K,
-Most recent M.B. purchase, Cost-a-plenty, Gulps BioDiesel extravagantly, and I love it like an old dog.

W114, 1975 280E Custard Yellow,
-Great above decks needs chassis welding--Really will do it this year....