I put my EI unit on the left outside of the engine box and wrapped it in 3" aluminum foil ducting tape for further shielding. Don't have any problems with RF interference but it sounds like you may be getting outside interference. Pretty hard to control that without PCM. Ask your club members if they have tried any other fixes for the outside RF they are experiencing and make sure you program a failsafe to cut your engine if you do get a hit. Be careful with that polyurethane glue, it foams up quite a bit.