Get your wizzy to MT for you 
, although that will probably mean you will do even less healing since the Dispersion stoneskin proc will block 80% of all the mobs attacks.
Or you could tell your shaman there is no room on the raid and do the zone without wards. Another trick is to tell your templar to meet you in Tenebrous Tangle, promising to port them to KJ. Wait till they zone to TT, and port yourself to KJ without them. Quickly zone the raid into PR. They will then have to run to KJ, giving you at least 20mins to actually feel useful!
In all seriousness, if the mob is not doing enough damage to keep you occupied then you have no option other than to dps.