Most people here are paddling whitewater boats and rivers, the paddles are different from touring paddles.
Whitewater paddles are generally shorter and with bigger blades. They are made for quick powerful strokes whereas touring paddles are longer with thinner blades for slower more efficient strokes.
Try out both sizes and see which one works for you. 10 cm may not seem like a lot but after a few miles, it can make quite a difference.
my gut tells me 230 will be enough but I don't paddle rec boats that often.
"Paddle silently, boof loudly"