Just yank your cylinders and send them to Kevin @ HJR. He can get them ported, bored, honed, and new top end kit for you and ship them back to ya pretty fast. Great guy to deal with and he does top-notch work. It won't hurt you to have your bike torn apart for a couple weeks, or however long it takes.... Its not the end of the world. Get the work done by someone who does good work and you won't mind the down-time. Plus, you'd be pissed when you blow the $ on some big bore kit and someone kicks your ass with stock cylinders with a cheaper port job.
Have you looked into any other cylinder options? Twister cylinders, Cub Cylinders, Serval Cylinders... There's better options out there than the Athena kit.
- Jared