ER4 is much better than Andro if you value the tone of musical instruments. The fit is crucial here.
As for Mr.Green - it's just overhyped for "features" which I can hardly call unique. A good analogy would be playing with equalizer. You're fiddling with it & get something in return that sounds kinda "fun" albeit tonally incorrect. That pretty much sums it up.
If you're into multi BA, give a try to new Sony IER series. Might get rid of Andromeda and resolve the issue with fit.
Yeah that my main gripe with coloured headphones there sound sigs can be easily mimicked, On other flatter headphones with EQ. This is why I've never got sucked in with IEM's where the sound sig is the hyped features.