Carb tunning/mod question

When i went for 15 to 18 to 20 degree Initial you could here the eng respond in sound and rpm. When i went to 22 the rpm didn't seam to change much when i went to 24 (24 initial/42 total) My MPH fell off. went back to 22.
It has never Kick Back on me but when i had it a 24*, and warm, you could hear the starter struggle just a little when i first started to turn it over.

No vac adv hooked up, only springs. Comes in at around 1500 and is all in by 2500 RPM. The secondary idle screw was turned in until it didn't cause the throttle blades to bind at close, then was turn 1/4 of a turn. I then turned it approximately another 1/4 turn. I just when out and look/turned the idle screw. I'm 1.5 turn from closed throttle......Does that seam like to much???? Maybe i have a bad metering block??? I didn't pay attention to how many turns it took to set the fuel slot to a Square?

The other problem I'm fighting is i have 5" of vac and a 4.5 PV. guess i will start with a 2.5 PV, see if it will idle around 800 and then try to adj the mixture screws