You should shift at the best point possible for your setup. I mean, if you are holding a gear but losing power, then you should shift. On the same token, if you are shifting too early, and then don't have good power coming into the next gear, then that's wrong too.
Your car is lighter, and your VTEC point is really low. I don't know how good your exhaust is, nor have I driven your car. You know better than any of us where to shift. I take my car right up to redline, since my exhaust allows me to make power right up to the fuel cutoff, and I need to shift high to keep VTEC engaged coming into the next gear.
Launching is going to be your key. Feathering the clutch, feeling how much power you can apply to the tires, and where you start your revs at are also going to go by feel.