Threading has been working well for a while now (Plenty of variety of threads produced), so the PWM board change was the total solution.
Having said that, Constant volume cutting is a little bit strange. First cut fine, but others way deeper than expected.
Expecting 10 cuts, I get 5 (First cut OK at 1/10 of total volume). I do not think I have missed anything. Mach3 Does this type of cut correctly.
Mach4 - Constant depth cutting is Working fine.
Constant volume is my preferred option, so currently using G32.