Did you try just richening up the idle mixtures screws, First.?
Did you do the mirror test to see the rpm that main jet fuel flow starts at? It my be starting too late?
(high speed air bleed too big. (It doubles as a kill bleed)
The blower case must be warm before making any tuning evaluations.
( fine tune idle air bleeds by hand by soldering a pair up and drill with a 1/16" .062" drill bit, then hone by hand with the bit, as required, to fine tune the idle AFR.)
First thing to do is verify no vacuum leaks and No exhaust leaks. Leaky headers/gaskets will really screw up the idle/afr.