Schematic looks good - i’d move the anti-spark XT90 to the end so it’s what you plug in to power the VESC - instead of two anti-spark XT90’s on each battery (though that works too, but you only need the last one you connect). And if you connect those, then plug in the final single plug to power the ESC/VESC it will spark since the resistor to slow the inrush is bypassed when the plug is fully seated…
As for the Multistar 10Ah 10C packs - like almost all lipo’s made - the C rating is usually MARKETING and should be questioned. One of the reason i shoot for higher C packs so that the actual real-world performance is sufficient.
The difference with li-ion vs lipo is i trust the actual tests of the 18650 cells done by Mooch and others on the candlepower and vape forums. Heavy load tests around the 15-25+ Amps are great indicators for our use.
And on the flats and only 120lbs - i think the multistars will work fine for you. I’d still watch out for over-discharging them, or under heavy use feel them to see if getting hot. Inspect frequently when you charge and look for puffed cells and any that sag early. Signs of a failing pack - stop using and charging!