yep, well it's confirmed. Recaro don't supply the backrest foam for SR3 seats anymore. Capital seating recommended i take it down to a decent auto upholsters and get them to add more foam to the required areas.
Now that you mention pool noodle foam. I was wondering how well the latex would hold up on the corners. Seeing as though they would cop a fair amount of wear. I might try your suggestion Jack and fiddle with it to get it right.
Back to the drawing board then.
myth.....busted!