All,
After further testing, I will regard this issue as solved.
I would like to thank those that assisted me, your a wealth of knowledge and the help is appreciated.
I am now controlling the laser PWM using M67 E## Q## notation and the setup is working quite well.
Occasionally I have the slightest flutter in XY velocity, where it drops to ~90% of intended speed before immediately correcting itself. This speed variation isn't enough to noticeably effect any image engravings I am doing. Furthermore, the velocity flutter seems, after multiple tests with the same input file, to be a random occurrence. I will attest that to machine lag / jitter, etc because it happens sporadically, and my velocity is not nearly as bad as it used to be. Previously I would spend 90% of my time engraving between 25-75% of the intended speed, and now I engrave at the specified velocity 99% of the time.
Excellent improvement, thanks to all for your assistance correcting this issue. I hope this information can be beneficial to others in the future.
