For cam_test.py, try adding "-cams rgb,c left,c right,c" to your options. This sets the script to enable the left and right with color, I'm not sure if it does it by default but that's what I run with triple colour cameras on my 3P.
Also, have you run the full calibration or are you just uploading the calibration from the OAK-D? As Erik says, it shouldn't effect the video streams just running but may not be ideal if you're running a config for a different camera.
Here's the config file for my 3P, note that you'll want to change the fov value to match your cameras and adjust the translation values too.
{
"board_config": {
"name": "FFC-3P",
"revision": "R1M0E1",
"cameras": {
"CAM_A": {
"name": "rgb",
"hfov": 69,
"type": "color",
"extrinsics": {
"to_cam": "CAM_C",
"specTranslation": {
"x": -2.85,
"y": 0,
"z": 0
},
"rotation": {
"r": 0,
"p": 0,
"y": 0
}
}
},
"CAM_B": {
"name": "left",
"hfov": 180,
"type": "color",
"extrinsics": {
"to_cam": "CAM_C",
"specTranslation": {
"x": -5.7,
"y": 0,
"z": 0
},
"rotation": {
"r": 0,
"p": 0,
"y": 0
}
}
},
"CAM_C": {
"name": "right",
"hfov": 180,
"type": "color"
}
},
"stereo_config": {
"left_cam": "CAM_B",
"right_cam": "CAM_C"
}
}
}