[MajorDisaster]

Just an idea, and you probably tried something like it already so excuse me if this is old hat, but what happens if you drop smoke on them so they can't all return op fire at you? - ideally so you only "see" the first wave. Throw in a bit of arty as well to keep the rear waves pinned down. That way your guys should get surpressed less and be more effective shooting back. Maybe I'm under estimating the sheer quantity youre talking about.