Thanks Rod, I'm 21"lengh in the back. the Exos is a 'M'fit. I have been keeping the hipbelt on or above my new found hips, [before the slim, that area was bulk.] I acutually have hips that can be seen now!
I thought about cutting up a Z-rest and padding it out that way, but that would be a waste of a perfectly good Z-rest?
Perhaps a refit might be the solution - thanks for the food for thought Rod.