I’d say that is probably accurate, in time at least. 3/4” cuts won’t take much to get up to temp. Also, temping, are you going from the side with the probe or from top down? Probes seem to work great based on your boil test.
I’ll add that I have never smoked pork chops, so don’t have the experience but I’ve smoked chicken parts and those take about 90 minutes, maybe a tad more at 225*.
As for your smoker, do you have an analog? Once it stabilized, that’s a pretty good reading there - 207 with the thermostat at 200? The 40 degree swing is due to getting the temp up to your set temp, once it starts to get there it’s going to start to back off to stabilize.
Is that what you are asking about? Hope it’s helpful. I have a 3D, so I see the temp outside, but I have never cross referenced the box temp with an additional probe.