Things I have found useful with salvage missions:
A nimble ship that can get you into the dock without being scanned is handy, as often the salvage required can be illegal.
A fast ship is useful for getting out of dodge once you have the cargo, and are waiting to jump
Good shields are invaluable. The best method I have found is to drop in, launch a plethora of limpits, then once you have the goods, jump out. The better the shields, the longer you can wait. Bi weaves still rock if you are stacking these missions though, as they recharge between encounters.