I have met Jerry and know he has cleaned more grease from under his fingernails than most of us will every put in a grease gun. I think he is trying to say this is a non problem and we are beating it to death for no other reason than we don't play golf, at least I don't.
If you don't want to use a volt meter in place of the amp meter which most people do, including me, then you leave yourself few options. You have covered most already. BTW, I'm retired from making a living doing instrumentation and instrument design and it bugs the heck out of me when a meter reads incorrectly as I believe it also does you. But you got to see the big picture in the fact these amp meters were not built to be percise to begin with. They are there to give the driver just an ideal of what is going on, not what the exact charge/discharge rate is/was. If that is what you must have then pull the amp meter, sent it to one of your engineering buddies. Using the test equipment any engineer worth his salt has, he can build you a shunt which will allow you to correctly read your meter IF there is not to much non linearity involved.
I also know Jerry wants no one or any equipment to be harmed by some of the stupid things we do, that's one reason he's here. Now a pesky fly or mosquito is another matter.
Jerry, have I used up my allotment of gigabytes yet?
