Medusa V2s and MMM/MM - Need some advise!

Thanks Finnster, totally forgot about that formula :D Makes sense now.
I could do 8S a123s easily, as that just needs me to series up the 2 4packs, but I'm pretty sure that's more volts than the MMM can handle :(

Oh, I also forgot the most important reason that I switched to 2p config - runtime.

We run 6min races at my local club, and they're starting to add in 10min mains now, so the 1p config meant I couldn't finish races.
The reason I dropped from 5s2p to 4s2p was weight.

Also, someone just pointed out in another thread, could my uber long motor wires (almost 20cm) have something to do with the higher amp draw with a 1p pack?

And another question; for arguments sake, what would happen in my setup if I changed out the 8XL with say a 6XL (ignore that the Feigaos are only rated to 30k RPM). The 6XL would be higher KV and so in the same setup what would happen? I assume the car would go faster and I assume pull more amps, but what else? Just trying to get my head around what the pros/cons are :D