Slower and less efficient than a mage, especially since you're adopting the mage play style and losing a lot of your dps to do so. Beasts where not designed to sit back and cast while the pet tanks. Beasts where designed to fight along side the warder. Your way works that's for sure. But you are playing your beast like a mage. Get a staff with staff block aas and get your butt in there and tank with a healer merc. Unless you're poorly geared or have low aa you should be able to top a caster merc on balanced. The thread us what class solo/molo the best and frankly beasts are not even top 5 unless geared to the teeth with a boatload of aas.