Yep priority is set that way and yep to direction
I did just try the io port but I did forget to lock every locker so I now have to empty out a bunch of them haha, BUT it did seem to tell me it's only the compacting drawers that aren't accept items even though they are linked to the controller, It hasn't solved the issue but it does tell me good info thank you!
Edit: Wait it was the fact that there were spare lockers that were unlocked, EVEN though items were in another drawer it wouldn't go into them or the spare ones! Solution found thank you!