I received a bunch of 3.96mm JST-VH connectors, and they are awesome! They're much larger than the JST-XH connectors, so their 10A rating definitely inspires confidence.
However i'm still unsure about the PCB. I want to perform some thermal tests on different types of high current traces with the boards from this specific manufacturer (JLCPCB), so I ordered a handful of PCBs with slightly different trace designs for the hotend heater and thermistor.
I'll run my tests and report my findings once the v.2 PCBs arrive (within the next 2 weeks).