IDF Tuning Help

[jabbott]

I have a gt40 kit car with a 302 with 48idf carbs on it I am trying to tune.

Trying to get it tuned and this is where im at.
40mm choke
165 main jet
180 air corrector
F11 emulsion tube
0 pump bypass (changing to fix overly rich tip in)
52 idle jet
idle screw 1 turn out

Right now the idle is pretty good but its pretty rough between 2000 - 2500 rpm part and full throttle.

Here is a copy of the last dyno I did with the afr on it.

I know I need less pump shot, so don't even take that into consideration.
Its rich down low and as the rpms go up it gets leaner. So I was thinking of lowering the air jet to make it richer up top which should flatten the afr curve across the rpm band and then going down on the fuel jet to get it back in the mid 12's.
Also I have no idea what is causing the lean blip at around 4000 rpm.

Thanks, any suggestions would be great