Anybody go from performer to an rpm air gap

Are we talking about a plain 'performer' or a Performer RPM? A plain ol' Performer is not a high rpm intake. Somone can correct me if they know different but the plain Performer is was not a aprt of the design program that turned out the RPMs.
A 'Performer RPM' ought to do some good at higher rpm if you are using a unmodified Performer. Whether to us the regular or air gap version depends on the temperature situations you're dealing with.

The orignal Torker was supposed to be sweet from 2500-6500 rpm. You should be able to find the recommended range for the II version, but likely its the same.

Sure its possible to be losing some in the exhaust or the timing. If you have a tach drive distributor, the curve in that is great for what you're doing. It has its drawbacks, but great for higher rpm consistancy and power.