Head unit skipping; is mounting angle the problem?

So I was just about to re-run dedicated power and ground wires, and even look into running my remote wire to a dedicated accessory switch because my head unit has been clipping lately on heavy bass notes. Do I need a capacitor? More batteries? hmmmmmm.

Well, I finally figured out (with some help) that the problem is just that the head unit can't handle the vibration caused by the subs in the boat. We pulled the HU out of its slot and just sat there and held it, turned up the volume, and sure enough, no problems at all.

In addition to that, my local stereo shop told me that coupled with the vibration from the subs that is causing the clipping, the fact that the head unit is mounted at a downward angle makes the CD tray and "anti-skip" mechanisms function poorly.

Can anyone here who has a Malibu with a) the HU mounted at the downward angle in the driver's right side armrest and b) pounding subs, recommend a head unit with superior anti-skip capabilities? I hate to be limited to the radio and the iPod with there's a lot of perfectly good CDs to listen to.

thanks a lot.