thanks blade, i had thought about the resistor maybe needing cooled, used to run rc cars and used a resistor just about that size to discharge the batts after a run and it got HOT so it was deffo something i was considering.
Another idea i'm considering atm is to cool the bottom of the PCB board, with some of
this stuff as an interface with a copper plate. Although i'm not yet sure if this would be at all beneficial (prolly not), still need to look into this further anyway.