When I am not at WOT I can rev all the way up and have lots of power. When I go to WOT it feels like I hit a brick wall at about 6k. There are no CEL's and also my Tach jumps around after 5k, but speedo is perfect, and when in neutral the tach works perfectly. Oil is good, everything is good. Did a leakdown and comp. test and it was 210 on every cylinder. Also sometimes it feels like there is no power and it hesitates below vtec, but once vtec engages it pulls nicely. Any ideas on this? This is for a H23vtec

 

just an idea but check all your engine grounds, also check to make sure your vss is not loose. i know my broken one causes a lot of strange problems

 

This is most likely ECU related, you need more tuning to give the powerband better linearity and smoother power delivery. I am assuming you have a chipped ECU or something like Hondata to run your setup?