I've been gradually working on the tips given to me from the last mix I put on here for feedback and a new improved version is just about done

However, I thought I'd do a quick check on what the mono version sounds like - mostly fine, but my super wide phasing synth pad pretty much disappears when in the mono version of the mix.
So far I have tried changing the polarity of the synth's left channel - this improved the mono level a little (not as much as I hoped) but the result doesn't sound anywhere near as good as the original noise in stereo.
I am suspecting that one of the causes of the problem is that I boosted only the 'Side' level of the synth sound to push it to the edges of the mix and leave space for the other instruments, if this is the case then is there another way of getting the width that would be more mono compatible?
Is there anything else I could try?
Thanks in advance.