Move the IFR to the lower location so that you will be calibrating liquid fuel vs fuel and air bleed air at the "high" location you are now. That deal always screws things on the idle up.
I helped Cliff Ruggels with his 4781 850 carb years ago. It was always a bit rich.
Cliff Ruggles had a great idle calibration with no more than a .074" air bleed required.
KRE said (according to Cliff) Don't touch it it is perfect on the dyno. That was years ago but the info is still valid.
A .084 air bleed says things on that idle circuit are not right.
AED has always had some "different" calibrations with their carbs.
Send me a PM and I will give you some of the 850 factory carb specs that might work better.
Stock jetting on a 850 carb with downleg boosters is #80 jets. Annular can be about 2 sizes smaller.
Annular Boosters might be able to run a #78 jet because of the stronger signal from the boosters.
When you PM me we can talk about where the throttle blades need to be on the carb and if the AED carb is even machined close. I assume this is a 4 corner idle carb.
Tom V.
ps we can document what you did so far then try a few things like Holley did them and see if the carb matches more closely to Cliff's calibration.
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"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
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