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What you want for set screw knobs on knurled shafts is those little filler brass cylindrical washer adapters. The come with some knobs (QParts), but are kind of hard to find, so I always order extra. Solves the "not centered on shaft" problem, and stays on better too.
not to spam, but these little guys: True Custom Shop® Brass Split Potentiometer to Solid Shaft Adapter Bushings 12pk | eBay
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With normal pots these are great but with stacked pots the knobs still wobbled slightly too much, and got stuck into each other. At least with THESE particular stacked pots. But like I said, they were very poor quality pots so that might have been part of the problem.
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but nothing tops the matching-headstock fervor.