While you slightly increased compression ratio its not enough to kill your top end. I believe you also reconfigured the port timing to favour the top end which should have compensated for the slight increase in CR.
The needle won't have all that much influence in the 3/4 - WOT area. Its predomidantly the main jet working there. I personally think you've probably been a bit rich on the main the whole time. Any easy check would be to drop a 165/168 in and see how it runs. If its a noticable improvement its telling you something.
The head work in theory will have also improved the engines efficiency, this could actually result in smaller jets being required as the fuel is now being placed where it needs to be and burning entirely.
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