Future Steps/Considerations

Buying motor capacitors to simulate motor controllers for testing. 
2 x 130 uF - https://www.digikey.ca/product-detail/en/C4AQLBW6130A3NK/399-17010-ND/8345973/?itemSeq=318056199
or 3 x 90 uF - https://www.digikey.ca/product-detail/en/kemet/C4AQLBW5900A3OK/399-17008-ND/8345971
Note - double the above quantities since there are 2 motor controllers.

Change precharge resistor values from 3 x 1 kohm to 3x 300 ohm TO126s to increase precharge speed. Power through resistors shouldn't exceed 8.67 W. 
https://www.digikey.ca/product-detail/en/caddock-electronics-inc/MP915-300-1/MP915-300F-ND/3013451

Change discharge resistor value from 1 x 5 kohm to 1 x 2 kohm TO220 to decrease discharge speed. Power shouldn't exceed 11.25 W.
https://www.digikey.ca/product-detail/en/caddock-electronics-inc/MP930-2.00K-1/MP930-2.00KF-ND/1284425

Change connectors from ultrafit to microfit.

Change SR latch to something more simple?

Change thermistor design. Only turn off precharge via firmware?
Note - motor controllers will discharge in 15 seconds.
Disconnect thermistor from precharge circuit, only connect to MCU?

Have two sources for power. One for isolated side and one for non-isolated devices such as fans. Add one more load switch, take out off circuit on isolated DC/DC.

Look into higher voltage rating iso DC/DC

Switch Relay FET to the same ones on BMS carrier. SOT23 is much easier than QFN.