Had 7 flights with the Skybolt and it never missed a beat (although a couple of the early landings made my heart miss a couple!) Final two flights were perfect and she three pointed both times.
So it looks like the IGN. module was the problem. I have ordered two "Smart Fly" Kill Switches hoping that with the true optical isolation it provides will eliminate the interference in the module on the Supercub - else I will have to order another module for it as well. However, I will have two GOOD Kill switches on my gassers which makes me feel more comfortable.

Of interest may be that the chap I talked to at Smart Fly could not say if the RCexl could damage the IGN. module, but he said they have damaged the RCVR!! That's a scary thought!!