Thanks to two of you for at least your constructive replies!

So I've been driving more and trying to ignore the leaning thing and I barely notice it any more. I've also noticed that this car has EXCELLENT support for my lower back.

What I think I've noticed:
-The "flares" on the edge of the seat (where the airbags are) are angled too much and such that my (reasonably broad) shoulders don't fit "in between" them and moreso sit right on top of them (so they kinda dig into my shoulders). This is gets rather uncomfortable after a little while.
-I'm thinking that as my right arm is my main one, my shoulder/back muscles in it are probably larger, and the above problem is causing it to stick out more giving me the sensation of "leaning" to the left a little.
-I've noticed the seats for the next gen of Euros appear to have a wider back and the flares on the sides are angled out a bit more, wonder if these would fit in the CL9?

I love the way this car drives and looks, and I'm a huge fan of Honda's reliability so I'm really not keen on giving it up!
If I can't put up with it in the end though I may need to accept that Honda's aren't made for people of my build. Still, there's no way in hell i'm buying a Holden just because it's bigger!