Aye Dan, that all sounds positive and I agree that the Iridium plug appears to make starting more reliable.
As for tank restoration, do it yourself, if you can and be aware that I have seen POR15 not adhering. BUT and it is a very LARGE "BUT" I do not know if the preparation was done as well as it should before POR15 was installed? There is also this "experience" posted on the forum from 2013:
Tank_refurbishment? Caveat emptor!
Sally threw an electrical wobbler yesterday, no indicators and what appears to be a direct short on the battery!

So, all stripped out ready for investigation today. Still ran beautifully, thanks to the separate CDI.

Maybe I could borrow your Uncle?

Enjoy the beastie.
My regards, Bill