Mikey,
When I tested my smoker, I initially placed the probe in approximately the same location distance wise from the wood box as the built in. The remote had a much higher reading than the built in. On the second test, I placed the remote probe in the same location and on the same plane as the built in. Temperatures were more closely aligned than before, but still different and it was disheartening. I boxed up the remote and stashed it away. Both the built in and the remote are digital. Which should I trust? I am sticking with the built in. I really have no choice as it is fully integrated and controls everything. But I do get good food, moist and tender every time.
If I remember correctly, the SI bulb is parallel to the back of the smoker. When you have the time, and if you are so inclined, paper clip your Maverick in the same location and in the same orientation. This way it is out of the direct path of the heat. You may want to place a clean brick or some other heat sink item in the smoker when you do this.
You should get a quicker reading with the digital as the bulb capillary type probes have a time lag. But I am curious if after an hour or so, your temperatures are closer. Maybe start at 150 and work up in 20 degree increments. Your research could prove beneficial for all.
Dave