Maybe, but after a while I think you'd adjust naturally to the half of an inch different. I can't see it being that big of a deal, especially if your original paddle size works for you.
Yeah, they are sweet, the Koho 589 models. i love them.
I have heard of the original swiss-made custom knee pads and they are extra sweet. A goalie got a pair of them somehow from Switzerland.
I have the same bag and I love it. The bag is a beast.
Wheel bags are awesome. Easy to use and saves my bad back. I have taken my fair bit of comments about it over the years but it's all in good fun.