I FINALLY have a working ammeter... had to go through four ammeters, three voltmeters and three isolated power supplies. Have NO IDEA what I was doing wrong before, but I just got the latest ammeter and isolated PS installed and took it for a spin... all seems to be working, so I am NOT going to touch anything!!
Under full throttle I pull between 200-300 amps.. moderate acceleration keeps me under 200amps and for the short spin I took, it looks like a constant 40mph on level ground is ~ 75 amps... Seems reasonable, yes?