I would take off the bumper again and make sure that clips on the car aren't bent. If they are bent, gently bend them back. Also make sure the bumper (when not mounted on the car) looks okay when sitting on the ground (preferable sitting on the ground on a blanket).

It sort of sounds like when you took it off, you might have bent the bumper plastic panel a bit too much on the right side. I can't think of anything else to try. Sorry, anyone else have an idea?

If you still need help, try doing a search or posting on www.honda-tech.com. They have some pretty knowledgable people of that board. The Type-R section is pretty good, too.