However you did it, your pulled pork looks great. We each have our own methods. Experiment and see what works for you.
I preheat my smoker without the meat but with the water pan. I usually preheat my apple juice, or whatever liquid, and put it in a water pitcher with a narrow spout. I put the pan in first, then I add my liquid from the pitcher. It stays pretty warm, just in case I have to add more liquid later.
I don't put the probe in my meat or my meat in the smoker until the smoker has preheated. I have a MES, and it doesn't take long to recover heat after I add the meat.
Just another tip: I don't "wash" my probes, but I give them a good rub with an antibacterial wipe. I use the disposable kind that has a bit of texture to it.