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I'm very careful not to overuse the enricheners on cold startup, and get them off ASAP.
I have the stock slides on my 76-LeMans and the following:K5 needle on middle clipAB 265 Needle Jet60 Pilot Jet140 Main JetI almost never use the chokes, just twist the grip a few times and it usually starts right up.
The issue isn't how much you use the chokes, it's weather the rubber in the bottom of the plunger is sealing off the choke jet sufficiently or if the cable is long enough/not getting hung up to be all the way down and not slightly hanging the choke/enricher circuit open
When was rebuild? Oil consumption????