This is an interesting problem. Your posts and graphs regarding your lighting blow me away. Nicely done.
Because you had this issue with your older lighting and the new lighting, which seems very reasonable according to your graphs and you are quite careful with acclimation, your melting issue doesn't appear, to me, to be lighting dependent.
Your info states that you are running carbon, which should go some distance in treating a chemical problem.
Seemly that leaves bad actors such as various types of diseases, fungi, and parasites. You did lose your fish to velvet. So you might want to think along the lines of a uv sterilizer or might want to look into vitamin c dosing. Just a guess......
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