Hi, Roger
One piece to your puzzle, Remove the M3,M5's from your Cam Post's and use the Z Direction pin to trigger your Laser on & off, Z- neg. will turn it on and a Z+ pos. will turn it off, This should remove the delay's your experancing.
Hears a LazyCam post with the M3/M5 removed, If you use it with LC's Mill Load you shouldn't have delay's, If you use it with LC's Plasma Load you can have Pierce delays also and a Mill and Plasma G code file.
You'll need to work in a Safe Mode Lockout "Button" to jog around and insure the Z is left in a Z+ pos State, A logic IC that see's the Safe Mode Lockout "Button" state and the Z direction Pin's state to fire the Laser.
Just A Thought, Chip