my Gladiator is 15, and my MRD is 28, So far I've had zero issues with Healer hate. 2 Overpowers and a Flash will keep aggro off anything but a determined DPS.
I mark ones, request people focus said Mark, and my runs go smooth.
The only time Healer Enmity gets to be a problem, is if DDs are standing in red zones or generally taking a lot of damage that needs healing, or the Healer is dropping Cures and Medicas on full HP party members.

Even just quickly tabbing through the mobs I'm engaged with and dropping a Fracture is probably overkill most times.

Tomahawk -> Overpower -> Flash -> Brutal Swing -> Overpower -> HS/SS/Maim combo chains. Holds aggro off everything so far.