Frostmourne wintergrasp

Currently Wintergrasp is won around (my experience) 95% by horde.
Alliance is WASTLY outnumbered, and the current buff to dmg/health etc that is given is simply not enough to balance it.
Example today: we were around 35 alliance vs what I estimate around 150 horde holding the front gate and every single siege engine was shredded before even getting close.

I do not have any proper idea vs just buffing dmg/health further for alliance to try to balance it out.
Any other ideas?

Regards
anon

150 horde? How is that possible? Shouldn't there be a limit of 40 players for each side and those who aren't in the raid get teleported out?