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Would there be difficulties if a psi vampire has a servitor?
I don't think so. I'd bet a psi-vamp would actually benefit from the use of servitors, provided of course they use them properly.
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Would the psi vampire have to collect more energy (high dose) so sustain its servitor and itself?
I could only speculate but I think once the psi-vamp has made the servitor his/her investment of energy would pay itself off as the servitor collects energy the psi-vamp could feed off it. Its possible for a psi-vamp to produce and feed off many servitors, if the servitors are made to mimic the psi-vamp and drain energy from others.
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In manipulation: You would have a psi vampire feeding off a psi vampire of your creation residing in the higher cosmos, or the astral plane.
When it comes to psychic energy we radiate onto others as well as absorb from them. There are many qualities that make up our internal energy. True psychic vampires singles out the *psychic* (mental) qualities of the energy being radiated from others. A psi-vamp can't suck -psychic- energy from a random rock because it has no intelligence (or at least mental ability). Bare in mind that if we all radiate and absorb psychic energy then it would be safe to say that we're all to one degree or another psychic vampires. It just happens that for a variety of possible reasons some people are better at absorbing psychic energy than others.
That said its not just psi-vamps feeding off psi-vamps but everybody feeding off everybody.