So @janpom, I looked into this more with TITS, where I can log stuff.
Here’s a chart of the voltage from a couple minutes of racing.
@Dinnye is totally right. My 4x G300s read up to 1.1v different at rest.
Subtracting out this static offset, all voltages remain within 0.1v of eachother, even when pulling 100’s of battery amps. Considering this is the resolution of the data in the CAN packet, literally couldn’t be closer.
TLDR; there’s no appreciable difference in the voltage at the 4 vescs
Pending an even weirder setup then mine, I now think individual voltage logging is entirely unnecessary 
would likely only cause confusion to users (from the static offsets). Thanks for humoring me 