From what I can recall and the quick research that i did, Your power gain should have been down low. The secondaries when inactive are normally open. This creates a shorter intake primary for increased efficency at higher RPMS.
When functioning properly on a stock ECU VTEC should engage at 4400 RPM and your butterflies should open at around 5600 RPM. With an intake and not a rediculasly loud exhaust you should be able to hear a distinct change in engine tone at each of those RPM points.
So to change what your looking for, you shouldnt feel a difference at higher RPM only lower RPM.