Mike,

Can you give me an update, did the Airhawk work?

I love my new 660Z.....apart from the seat.

Same problem as you, within 15 minutes it's uncomfortable and just gets worse. I have even tried stretching and sitting partially on the rear seat.

The only way I can describe it is like the old tyre swings we had as a kid. Once your sitting in/on it there's only one position and you just slide back into the same trough.

So, looks like I might have to get the Touratech catalogue.