Just keep tinkering with the base idle. My old setup; 13.3:1, crower 404’s, 7lb flywheel (sold to lilgreenb18), titanium cam gears, and ITB’s. I never had one idling problem after it was set.
http://media.putfile.com/itb-hatch-idle
turdteg’s gsr, 81.25mm ctr, skunk2 stg2, flywheel, cam gears, 42mm itb’s
all im saying is you can make it work. what throttle body is it?.. do you have water going to the fast idle if its stock? first things first, jump the 2 wire for diag mode, unplug the iacv and set base timing with the idle screw above the TB inlet. once thats done, then continue working the problem. if it has to idle at 900-1000rpm, then so be it.