Wading in... I actually just purchased a Johnson CM30 but have decided not to install it and purchase a OEM bosch unit instead. I won't be changing anything else to my engine, prefer to leave it stock, so to me it is not worth even the chance that IC fails.

Will probably be selling the Johnson CM30 if anyone is interested. It is my fault for not doing enough reading on the issue before buying. I was aware of the potential problem at the time of purchase, but the more reading I do the less I want to take the risk.