D'oh! Sorry, I missed that entirely. I thought I did something smart by accident
After 24 hours of drying, I picked up and racked all the chips. I'm happy with the results, but I should have topped up the oil a bit sooner. About 50 chips out of 648 (all the same color, most likely about 300-350 chips in) ended up having a few splotches, even after doing the rolling edges with my thumb along the way. I did about 300 chips after that with a fresh batch of water and oil and those turned out just fine.
As done above, just touched them up with a towel I had sitting around with oil from yesterday.
A few photos to come later on in the week.
I'd definitely use this method again based on the results.