I am wondering about the wires going to the sensor. They have some type of glue supporting the wires for the soldered part of the wire right at the sensor. From there back I cut silicone tubing(lengthwise) to wrap around the wires. Perhaps the weight of the tubing did more harm than good? I had a tywrap at the engine mount point fitted loosely.
Interestingly I am using an EDR opt kill switch. When i bypassed the EDR I started to get interference. It did seem worse last time at the field when I bypassed it again. I remember reading the Pro-spark instructions saying that if the unit is defective it can cause interference. How the EDR covers it up is beyond me.