I put a set of Westin nerf bars on my '06 DC. Ever since then, I've been getting a lot of stone chips near the bottom of the driver side doors.

Coincendence, or do the bars deflect debris up to the doors? Also wondering if the touch-up paint from my dealer is the best way to fix 'em (without spending mucho bucks). Are there clear shields available, like the ones on the fender?
Any suggestions would be appreciated.