I know there's a lot of debate about whether healers should DPS or not, but forget all of that!

I commonly find myself with a bit of downtime in between heals in the content I'm running (since I'm mostly just doing WP at the moment). For that reason, I usually make sure the tank is doing okay, hit them with a Regen, then switch out to Cleric Stance and start my normal rotation of DoTs and a Stone II or two if I can fit them in, all the while switching out to heal if I need to. This seems fine to me.

However, in a few runs recently, I've found that the moment I switch into Cleric Stance, the tank takes a huge spike of damage for one reason or another, which leads to me becoming a bit flustered (I'm a nervous MMO player!) and scrambling to switch out of CS to heal the tank up. The rest of the run I'm more reluctant to switch into DPS, since it happens a few times and throws my confidence.

Is this normal? Got any tips for best practices?