I can tell u that I get accurate models (except for shrinkage using 1:1 red/cherry mix. Shorter exposure times and almost eliminates bleed that u often get with the cherry (prob reason for your thickness issues.. I have posted this so many times i have lost count. Best printing for me is 30 xy 30 Z (1.2 machine) 1:1 mix. Other reason for thickness issues include focus, zoom, and over exposure.
The cherry always gave me thicker models and thicker prongs. Especially on micro prongs that were close together. For fine details try the 1:1 mix.
You will not ruin the resin in the vat, just filter, It doesn't go bad from a failed print. And yes lowering the exposure using the MSM might help if expoure is the issue. The MSM is there because all lamps are not created equal.; You may have a lamp that is "hotter" than others.
Dance like nobody's watching!