Wow, amazing. Thank you all. Indeed I‘ve been using some widening techniques on my synths which might affect the Eventide Space. On there, there‘s only one effect that allows dual mono. While playing around with settings now to un-widen the synth sounds before they go into the Space, I also ordered the Boss Dimension C after watching some videos. Will post some results once I got my sound breathing 
Thanks again, to all of you!