Not there yet but will be trying this soon as well. Are you running it in PWM instead of TTL? Also assuming this is with PEP5…. have you seen this thread;
They move from a 1W 405nm laser in the first posts to the 6W and around to a few others, post 143 shows some settings on the M140 at 2W that may… ahem … shed some light on a starting point.