Flammy needs some love. Isn't it supposed to be the ultimate 2Her? Almost nobody uses it, and almost nobody who uses it can get very far with it.
As it is, it hardly does more damage than the war cleaver, which is easier to use for a number of reasons. Even loomed to MW, it's still not fast enough to get past the manual blocking of a decent player.
A damage buff is a good place to start, but please leave the speed alone. Maybe increase its weight?