SOLUTION:
I ran into Tiny in game and he reminded me of simple solution:
My hunters never crashed like this, because they were almost always at range blazing away and KILLING STUFF!
The reason my melee teams have been crashing all slaves' clients/windows is because I never performed the macro: /of break, and so my toons were all trying to /of follow my master AND interact with target. BLEW MY PUTER'S MIND and crashed the bulk of my clients.
Hence:
With melee team, hit /of break macro going into melee
and then /of follow to regroup and follow leader.
Minor problem: before every engagement this makes alot of buttons to be mashing. I will overcome this by combining the /of break macro with my InteractWithTarget command. This will also ensure I do not forget to DO the /of break command and crash my clients. PvP multiboxing is not as smooth, atm, as it was before the Blizzard /follow backstab, but it is manageable. I was so angry 2 years ago with Blizzard's /follow ban in battlegrounds that I simply left. I regret now not hanging around and waiting for geniuses like Tiny to figure out how to overcome this obstacle.
Thanks Tiny! Ofollow keeps PvP boxing alive and well!