tunnel ram update

I installed my tunnel ram this winter on my 340. Engine is 9.8 to 1 comp. Ported 2.02 heads, hughes solid 237 242 at .050 and .537 .542 lift. Intake is eddy street tunnel ram with to stock 69 340 avs. Got to take it out today. Its a little cold blooded but once warm runs and idles really well. WOT it screems to 7000 rpm easily but I shift at 6600. Problem is on the shift at the bottom of the next gear it lays down just a bit for a second or so then recovers just fine. Any advise to solve this would be greatly appreciated.