I found this to be the hardest point in the game. Heavies are everywhere and its before you get all the badass weapons and the heavy takedown. I ended up sneak killing everyone else and using c4 on them.
C4 is my personal favorite heavy killer pre-skill unlock. --- BY SIGNING UP FOR THE TORGUE BAD ASS TOURNAMENT YOU LEGALLY FORFEIT YOUR RIGHT TO CRY, EAT TOFU, OR WATCH MOVIES WHERE PEOPLE KISS IN THE RAIN AND S***!