In 30/40 cap the strat is always the same kill the healer first. I've made it my playstyle choice to disrupt the healing game, save sleeps for when either I am in trouble, and w/e possible save my healer, seems to reduced my DR issues with sleep. I scathe to interupt the heals, make them LoS their team and heal themselves. It's open season on BLMs, so I just adapted to it by running from the dogpile and scathing a healer. Scathe is not effected by UI, costs little mp, makes a healer's life hell. However the scholar's pet will get slept from me, since people refuse to kill it, helps to keep the pet and the scholar LoS from one and another.

In order to win you have to shut down the healing game, bottom line, by either killing the healer, LoS the healer from their team, or interupting the healer.