Thanks Kermit.

So, on yours, is the back part level (the only part that actually is flat, if it's like the Inform)? I mean, I know the procedure to level it if I know what needs to be level, but it's that bump & dip that are the problem. The bump on mine is clearly higher than the flat back part. I'm assuming the bump is taller because it squishes down when you sit on it. Or - maybe it is an optical illusion, like you said. I'll have to study it some more. Or maybe it's an Affinity / Inform difference, or because my RL has more padding than your RXL.

When I leveled the rails it was diving down in front a little.

How do you like the Affinity? And the RXL version? If the Inform works on my road bike, I may have to get an Affinity, for my touring bike, and an Evoke for the MTB. Sigh, I wish they would have a clearance on all of them.

I'm amazed at how sleek DH's new Inform RL looks compared with my Inform RL WSD. His looks racy & minimal. Mine looks like a tractor seat beside it. And theoretically his is actually 4 mm wider.