If you're a career off-DPSing SCH, just go for max accuracy. It won't have an impact on your healing game whilst having a huge impact on your accuracy without lessening your MND as much with melded craftables.

If your off-DPSing is a bit more laid back without Ruin spam galore - being mainly casual dot reapplying whenever you can - then you can get away with having less accuracy as the likelihood of you missing two of the dots that can miss (Miasma and Aero) is not that high, with the increased DET values making ticks a bit more potent per tick, too. However, the more you DPS, the more you'll be crippled by the accuracy issues, so if you truly wanna hit some good numbers whilst not gimping your healing game in any way, stack accuracy and hit the accuracy caps.

Edit: @ the guy above me: pretty sure the OP meant his DPS numbers when he actually DPS'd away, not his numbers on a kill.