it's somehow sad how you treat the persons that want to help you. sitting on a "high horse" (saying in german) won't help you and will push away those who are willing to help you.
the reason why you get crackles with timecode is because using timecode is much more demanding than pure internal playback.
the reason i think we could find a tweak to make your system run without issues is that you can CURE your crackles by raising the latency. if that wasnt the case, i'd say ok - there's sth wrong with the vms.
but since raising the latency DOES work, this simply indicates that the higher demand timecode puts on the various parts of the hardware can and has to be weightened somewhere else.
you've been writing lines and lines of rant - you could have given more valuable info to find the culprit instead.
anyways, you made a decision - be happy with it.
*closed*