Well, I got smart – I talked to the people that actually manufacture the motor and controller and asked their opinion. I gave them the possible battery packs, and let them choose. Turns out that there is a “no-mans land” that all but the high voltage pack would hit. So I’m going to use the 349 volt pack (consisting of 109 batteries with 60 Amp-hours capability). Not cheap, as I was warned, and completely found out, but it should do the job admirably.
So, I await the billing and will get the controller updated at the factory. Meanwhile, the minor stuff continues to get cleaned up.
