I would do something similar to this The armor screen + charged barrier = 20% extra damage reduction + your heavy armor + you still have grav round spam for dps

I want to start off saying that it was a good guide with some very nice points made, even though its only up to lvl 21 where you are just starting to see the difference between damage and healing specs. I'm very very surprised you are still considering aclarity even though it hurts your heat management. It is vital that BH's stay under 40 heat so that they get the max heat vented per second. This is also why aclarity isn't very good on a BH, it will only give you more downtime between your heals to cast rapid shot, it is much better in my opinion to take the talents and get 6% increased tech critical. (something like this that also leaves 1 point to go into heat dampening or dmg reduction if you want)