I think this build is a bit beyond me.
I suggest you look at Navitas. I hear they were making an AC motor kit for a Gem.
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O man, Navitas is the way to go! Talked to a helpful rep and he set me straight, I’m ordering their AC motor and will update after I install it
Your problem is probably in your programming. I have multiple customers in Carlsbad that live on the hills and drive down to The village without problems. need to know your battery setup. When running lithium it is important to make sure the setting in controller are not to aggressive. Many people tune controllers for more speed with lead batteries. Then they install lithium and the motors burn out.