4.5 gcd's is just below 5 rejuvs (4.9 or so), at 3k haste cap it is 6 rejuvs.
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Dark shamans hc, I always have 4 targets, though wild growth is not my spell of choice, just keeping rejuv up on everyone and lifebloom on myself, and using the sagemender proc seemed better.
Also galakras too with the tower, but I would not really say that it is the best just because you only heal 5 people for a small amount of time.
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why would sotf make you more inclined to not using the glyph rather than more inclined to use it, also 41 tick lifeblooms? You have to not heal that target with a single target heal like HT or regrowth for 15 sec, then you also don't want to refresh it. Feels more like a restricting thing to do, rather just put up a rejuvenation with haste proc over a lifebloom.
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Seems like thok p2 seems like a bad idea to even use it on 5 people, only if you need to extend your range past 40 yds. as wildgrowth has a max range of 60 yds.
dark shamans hc definitely bad idea to use the glyph, even though it is not the spell of choice either way, as you are doing something wrong if you are casting wg on cd in the first place.