Too much diffusion is totally a personal preference thing.
There's no too much diffusion, no not enough diffusion, just what you prefer.
For me, that means going straight baller and going for as much diffusion as possible
BDV probably won't be able to help you too much with how that piece would pair with a solo, since he doesn't have one (and has yet to try one iirc)
IME, the solo can milk up just about any piece you attach it to.
The stock stems have a fairly restricted draw, which seems to be amplified by the glass piece you attach it to.
If a piece has any drag to it, it'll add to the drag of the solo, if its particularly large, that also tends to add to the restricted feeling.
As for that specific piece, you won't get the full performance of the perc like the vid, due to the restricted draw of the solo, but it will definitely work.
My favourite glass pairings for the solo are small pieces - VXC hydratube, toro microverter, aquavape etc,
But it still works like a champ with my bigger pieces.
I'd recommend a PVHES-GonG if you're gonna be using the solo through water regularly.