The bassani road rage b11.Heads are stage IV? I'm assuming stage IV means polished and ported? Looks like you were able to squeeze more out of yours then I did. I didn't have the extra 1K for the polish and port at the time and ran out of patience and time before my road trip.
What exhaust are you running?
So what do you suggest i should do?you have a vpc ,i wouldnt worry about it. it isnt severe.
looking back at the sheet ... it could be you have a little more hp/tq to be had in that area . 4000 rpm is where the vpc and clutch are working real good normally. so without a clutch graph to see for sure,it hard to say for sure.
it could be with a little timing ,that whole area will pick up some.