I recall playing that scen. and it's a tough one.
If you get a draw,then you've done well!
Don and Andy designed it,so you will likely get little help from them
As far as keeping bazooka's and RR's from firing at unwanted targets,just turn off the main or all weapons (to keep them stealthy) until the heavies come in.
The same applies with ATGM'S
The AI does not use z-fire and you may get some hard hits in if not too suppresed.