I'd love to help you test the profile, I'm currently 533ilv and 6/14 Siege currently. The profile is working great, although there are a few tweaks I'd like to see added. I've been using Vachiusa's Resto Druid profile up to 5.4 and recently switched to yours (due to Vach's profile spazzing on some boss mechanics, where yours did not). Here's a few things I noticed:
1) There doesn't seem to be a 'limit' check on Wild Growth. Vach's profile allows a setting for both player health, and a threshold for how many players are at that HP. I noticed it would cast when ANY player hit whatever health threshold set in your profile. This leads to Wild Growth being cast when only one player is taking damage, blanketing the raid for no reason. Instead it would be nice to have a setting for 'when 3 players are at 85% HP, cast Wild Growth' or something.
2) There seems to be a delay when casting Regrowth when it should be spamming it, if a tank or player is dying for example. It will cast once, then skip a GCD and cast Rejuv or something instead. This isn't a problem healing DPS really, but only when a tank needs heals spammed on them. Vach's profile has a 'Regrowth Tank' setting that I think would help fix this.
Other than those two things, I love the profile. I noticed it is much more responsive and seems to react quicker in general. It uses Rejuv much quicker than Vach's profile, which has increased my HPS by a good amount. Also Incarnation is coded perfectly, I love how it applies Lifebloom to blanket the raid (in Vach's I had to pause the profile and do it manually). Keep up the good work!
As a side note for mushrooms: I think it is best used manually, it would be nice to have a mouseover hotkey to place it, and a hotkey to use Bloom. Especially with the Efflorescence glyph it just seems like it would be better to use at player discretion than to automate it.