I finally decided to watch Hi-Evolution 3. It's not as bad as Hi-Evolution Anemone (and if you treat it as it's own movie seperate from E7 it's ok), but as a part of E7 it's not good (and I've no idea who's idea it was to decide to do what they did with continuity of previous series regarding it, plus the damage has already been done in that regard and Eureka's character assassination). It lacks not only the sublime energy of Psalm of Planets, but also the charm and humour (the original E7 is also quite funny too).
I wasn't even able to finish Ao.
That being said, I still love the original E7. I started another rewatch last month (even though I rewatched it last year) and it's still one of the best.