I disagree with downgrading the EQGs (at least their Element power). The whole point of Legend of Everfree is that Midnight Sparkle's power never really dissipated out of Sci-Twi, it was always there, and we were visually shown the power would've consumed her had it not been for outside help.
While the mirror provided the hax amp in Friendship Games, it was the Elements powers together that gave Midnight Sparkle the amp to become Midnight Sparkle in the first place, so the EQG Elements should scale regardless to Midnight Sparkle, albeit when together. In other words:
EQG Elements should still remain 2-A, possibly Low 1-C, as should Midnight Sparkle / Daydream Shimmer