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using the correct needles and mains?
contrary to black, plastic later model 30mm slides, your 32mm metals require "dressing" if not a certain degree of polishing, with special attention given to their guides (in the bodies). Lift can be checked/confirmed using moderate compressed air. (within my service I perform this routinely on EX500 carbs that use metal slides) The return springs are correct length, not causing binding in any way? Note some jet "kits" require cutting of springs, a no-no if returning back to OEM spec.
35 year old diaphragms, if never replaced, should be, especially those with holes of any size.
"Erratic" idle? IF your carbs circuits are truly clean, are synched and pilot screws set correctly (with new orings)....it should idle decent.
Furthermore, blocked transition ports could be causing some issue with reluctance to run over 4K threshold. I'll submit your carbs are not truly clean.
You've confirmed adequate valve clearances?
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