So I picked up an EP Slap E on eBay - damaged packaging, brand new string for half price.
After snooping about and hoping for a similar incredible bargain on the A I finally caved and paid regular price for one.
My reaction has been very like many other I've seen posted here. First impressions, yuck. Flappy, incredibly quiet compare with my Innovations, though clearly really well made strings. Just very strange.
So I left them at pitch tension for a few days and jacked the bridge up to 15mm at the A. And boom! I love them.
At a high action they are very playable, and project very well. As well as the Silvers? Impossible to say as with the bridge tweak there are too many variables. Really good even volume and even tension across the set too. You can just concentrate on intonation and feel. Great click characteristic and elastic bounce for slap, but really great for jazz piz as well.
I haven't tried yet as COVID = no gigs, but my sense is that in a loud band situation I might have to work harder to keep feedback under control as the whole bass feels a bit more lively and resonant than it did. But I'll gladly deal with that.