I'd be curious to know what RoH stands for. If you're talking about Rage of Halone that's a different skill from Inner Beast. Inner Beast is our gauge dump, which is where a massive boost in damage is supposed to come from. Without any kind of bonus for it then there's little reason to use it at lvl 50 as it stands except to get rid of our gauge or hit with a powerful attack under the effects of berserk.