One solution to the RFI. Go to an electronic supplier and get some ferrite beads (choke) and put several on each lead leaving the ballast. I had this problem and they completely eliminated the RF noise. I keep a supply on the truck. Lots of switching power supplies create RFI. Ever wonder why lots of electronics has that lump on the power cord. Thats a ferrite choke to stop HF RFI from going out the cord. They are cheap and come in both tube style and split to allow installation on a connected wire.
