Is that a battery in your pocket or are you happy to see me?
Ended up going in a completely different direction
Got batteries from Walmart of all places. They are deep cycle/starting batteries rated at 125A. I figure under heavy load it would be more like 50AH but for a 60lb battery that is $67 they aren't bad. I only got 4 of them, the other 2 will have to wait for more to get back in stock. I can fit 4 in the trunk and 2 behind the seats in battery boxes. Going back to uncut rear springs will get the ride height back to what it is without batteries. This setup should last me a year or more, at least until LiFePO4 batteries get a stable price and good availability.
So now I am just waiting for sprockets to come in and I need to finally order a controller. I am still leaning towards the 72V model since from trying to stuff batteries in there I really don't think it is possible to get 10 of them in the car without serious modifications. I might go ahead and order everything since I have one more week of work until spring break. That would give me a lot of time to do everything to the car at once.