holley 4160 help. 600cfm.

I know you made some progress recently on this (from another thread) and I think your getting close.

I'm not convinced that the secondaries are open too late. As Mattax said, opening a little quick can give the same sensation also.

I believe you still have the tight converter and 2 series rear gear. Some of what your feeling may just be the "engine getting up on the cam" between the 2 to 4 grand transition area.