Were yours fully burned in? Solaris Treble becomes much better and the soundstage opens up quite a bit after burn in (4-5 days).I did ever so briefly.
In my opinion Fourte has better bass soundstage fit and treble
Solaris has better mids by far and is way more affordable.
I believe @twister6 said Solaris soundstage is on par with U18t and tia forte