Here's the problem with having stock primary lobes and larger VTEC lobes. By increasing the lift/duration of the VTEC lobes, you change the RPM range at which they're effective.

With your stock cams, the VTEC switchover is about close to the point where the primary lobes run out of power and the VTEC lobes will make more power. If you just change the VTEC lobes and keep the stock primary lobes and switchover point, there'll be a flat spot in the powerband before the fat part of the VTEC lobes comes on.