Your cam sounds (exactly) like the one Bullet recommended for my 433 engine.
However I have only 9.8:1 compression, and 255cfm heads, and asked them to recommend a cam with max HP at 6,500rpm.
Based on them being correct (I have not tried it yet) I would say your camshaft is too "small" for your better flowing heads and higher C.R.
I agree with ScreamingChief, try a camshaft with more duration.
Good luck and have fun!
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