Dear @Matthew_Pimot,
Please confirm if you are sticking DRIVE SW 10 or you can move to new DW + DOS release? We notice on DRIVE OS 5.2.6 + DW 4.0 release, customer could run yolo v3 model. It is recommended to test your model with trtexec tool in TensorRT before using DW.
Please see the discussion in Yolov3 Implementation error in inference
Sample object detector tracker YOLOV3 model error inference if it helps.