After healing Tich (Normal), here's what my logs looked like with using WG on CD for a majority of the fight. The first 45-ish seconds didn't need it and then during the two other phases where you're dodging the laser I didn't need/couldn't use it. I'm sure someone here could calculate what my logs might've looked like different talents (such as SotF and prosperity, which probably would've been a tad higher thoughput).
EDIT: Idk why it doesn't show, but I ended at 327,022hps. If they fight went on for any longer like a few other pulls, it would've ended around 350-375k hps.
Those two gold dragon traits that you mentioned REQUIRE you to use rejuv, otherwise you're just being bad. Dreamwalker will literally do nothing without rejuv, and rejuv is the best option for Power of the Archdruid on consistent damage fights.
PS: I'm only using this fight as a benchmark for high/consistent damage fights, which rDruids tend to excel at.
PPS: If anyone has any suggestions/questions for my healing breakdown, please do let me know if I could improve. Ignore the tranq usage. My keybind/button bugged out on beta and wasn't working. I missed out on two more uses of it, since I was suing tranquil mind.