The depression you see might be a combination of both design, and also the fact that I had the seat sitting ontop of a CX500 engine upside down. So the depression might/should hopefully level out. The seat base has no rust on it and additionally the seat is missing the aestetic aluminium trim around the base - which is apparently quite a rarity these days.
Agreed- and not necesarily a very long time riding (perhaps even as short as 10 minutes) does make the foam compress and the positioning of the body change a bit. Unlike the ETZs I don't feel like my knees are above my hips (even on the old seat) and has a more natural forward lean. But also the foam is now constricted in it's shape too because it won't squeeze out of the tears that are apparent in the old seat cover - and therefore the general shape should keep better whilst riding too.
I don't think i've ever had a pillion on the Trophy anyway.. Besides which one day I'll want to make a proper rack and affix a top box which gives pillions a better feeling of security anyway.
I will update the forum accordingly if it feels better.
I was actually dreading removing the seat because of my already repaired/welded bolt receiver/clamp which had already broken it's weld once before, but it wasn't an issue.