Do I need a new mechanic?
Will you loose torque below 2500-3000 rpm? Yes.
Will you loose all of it? No.
Will you gain torque above 3000 rpm? Yes
Dump the four hole spacer. It's like putting a 2" washer in a 3" exhaust. The key is getting everything to accentuate the peak in the same place in the rpm range. I'd probably add an open spacer to the Weiand rather than a 4-hole to the RPM in respect to the cam you're running. It'd be cheaper too. :) If your cam were in the 224 + range, i'd then move up to the RPM manifold. 234+ range, move up to the Victor