I would stay affliction speced with a boomkin that way yeh can dot and run.

At the moment I run with 3 locks affliction spec all I do is send pet in, drop corruption/coa X3 (which is overkill) find next target non stop you can do the same with boomkin/affliction lock.

Another way would be to make druid more of a tank, hot'em up then round a bunch of critters up then have yer lock drop an aoe on em.