the hand controller freezes because it does get enough clock cycles on the bus that the hand controller and datalogit use
like i said, ive said it before and others have to, dont use both, use one or the other. even if the PFC hand controller looks frozen its still fighting for updates on the bus
and datalogit is doing the same thing, so you are likely to loose samples when logging and driving around. if you are knock logging, unplug the hand controller
apexi never designed to it be a multi device BUS, it was always intended as a single device bus point to point
datalogit added in the extra hand controller port for convienice reasons only, they should make the box disable the hand controller port when the logging function is active to ensure consistent results
but its probably not something they could code/build, its probably a limitation of the PFC bus