Two observations:
First, I am not a computer programmer, BUT George it would appear that activating the ALT-CTRL-DEL sequence WILL be putting more stress on the CPU, thus affecting the outcome...
(this nearly verges on the esoteric topic of quantum states... if you watch it, you change it...)
Second, it's also really obvious I'm not skilled at understanding g-codes...
Hood, I appreciate your line by line analysis...
I believe your conclusion is that the router is simply obeying its commands.
So, I think I may simply take individual lines and bracket them with parenthesis to turn them off and study the results.
I think Wikipedia's g-code explanation may become my leisure reading....