help with tuning an AED 750 Ho

Medium blue and light silver is usually what I run on most stuff. Initial timing sounds in a good range for nice idle manners.

Go here.
http://members.tccoa.com/392bird/carbtech.htm

Look at the pic of of metering block with PV in front of it. The IFR (idle feed restrictor) should be in location 6 or 25.

Once you get it close, you may fine tune it with an Idle Air Bleed (IAB) change.