I ran into this with cast valve covers. They were Offenhausers so you think high quality, right? The pits were horrendous. They not only look bad but as you are finding out they don't allow the wheels to do their work properly.
I was doing the covers quite cheap so I just told the guy that was the best I could do, and explained why. He was very happy with the job and understood completely. You might consider cutting your price and taking a loss if necessary to retain your reputation.
After that I made sure I put a disclaimer with my quote regarding the fact that if pits show up, there's nothing I can do with them.
The best solution in my opinion would be to plate with copper to fill the pits, sand and polish, then give it a good 3-part plating job. I'm thinking of partnering with a plater for just such items (don't wanna mess with all those chemicals myself yet...).
BTW, when you polish try over-loading the wheel with compound often - it seems once the pits are full of compound the wheel works a little better...
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