IMHO, as it stands now, all focus is drawn to center of board, if that is what you want then you're done as far as the radial burst background. However, I think your instincts about neutralizing the background are good. It should be a trivial thing to swap background to more neutral textured which brings much more emphasis to the game track itself.
One other thought, is that by removing the background entirely to transparent for a version, then the paper color/texture itself can be selected for the occasion when printed.
Just my .02
Oh, I wouldn't mind an ooch of drop shadow (couldn't resist - I'll shut up now)