Ah yes, I remember the motor with the damaged housing now. It was decent of GM to send you another. Frankly, with the procession of motors you have used, it's a little difficult to keep track. A bit like the peanut in the shell game
The Hightecbike kit[MXUS]that I have came with all the spokes as "inners", but still, the spoke heads just clipped the stock[placement]caliper. I spent more time carefully grinding clearance on the caliper than I did with the wheel fitment.
Interesting about the LVC feature of the BMS Battery 9-FET controller, I had no idea. I will be using my C.A. for LVC, so I will probably stick with my stock Shenzhen controller. I have a Holmes Hobbies Mini-Stealth controller[23A actual] as a spare that I might try out sometime. Perhaps with the C.A. current limiter.
Concerning a larger pack, why wouldn't you add more bricks to your two Zippy's?
I'm in the process of putting together a Lipo pack at the moment. Like you when you did yours, I'm doing a bit of soul searching as to which configuration, 12S, 13S[I also have a spare 48V Li-on charger not being used] or 14S. And like you, I'm going to go with 12S for simplicity's sake. The Turnigy 6S 5000 mAh [20C] from the USA warehouse for $42.63 ea. seem to be the best overall deal at the moment and 22 to 23 m.p.h. is fast enough for me.
Now the charger decisions
At any rate, I would like to take this opportunity to thank you for your reviews. I've read every one, at least twice[even with the messed-up text]. Your voice of sanity and ability to resist the upward power spiral has brought me back to Earth more than once.
BTW, poor paint job not withstanding, the burnt orange color w/ the black accents look great.