PS More probes is better:
Old coolstores had maybe 2 probes. Nowadays we put in more: walls, by doorways, top and bottom of evap. And every time we do that, we go 'oh look...we didn't know it was doing that.'
PPS Since you are 'detuning' your refrig to stay above freezing, there are phases where you may have to introduce some timers to prevent the refrig short cycling, which is both inefficient and hard on the gear.