The best solution is also the easiest. You need a Lyman "M" die in 45 Colt. The expanders on them are made for lead boolits. It will elimate all the fuss that you speak of. I use M dies in 44 and 45 because I load primarily lead boolits.
You can muddle through it with your own dies. You're doing right by keeping the lube build up out of the dies. It sounds like you may need to bell the cases a tad more to not shave lube. A properly expanded case will let a boolit sit on top of it...barely. It shouldn't shave any lube or lead upon seating.
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