Nice build. My pb (lvl 47) got Dawnstrike at lvl 35, because with Stamina, conserve energy, and lightform it just makes a great attack whiel minimizing the weakness. First, you've just agroed an entire mob, but with just 1 DR so in lightform thats no problem =). The other thing is, lightform boost your end recovery, so you can recover some end after Dawn Strike.
I have stamina 6 slotted too, my light form has 5 recharge redux and 1 DR, to try and get it as much as possible, to avoid having to use the shields, I only have shining shield, I got attacks instead for the others. Anyways instead of just using Dawn strike, try this: use lightform, move into the middle of your mob, use conserve energy, and then use dawnstrike. You should be able to manage the loss of end this way.
