I'm a newbie

Hi to all and happy holidays. I'm from Southern California where they eat more sushi than anything else. I myself on the other hand really enjoy any kind of grilling/BBQ there is. I have an array of Q'ing tools like a Weber Kettle, rather large Santa Maria type grill, 3 WSM's, 2 Backwoods, a Lang 60 and just yesterday my new YS1500 came out of the back of a FedEx truck. As you can tell by my list of smokers I'm pretty much a charcoal and wood guy. The YS 1500 is the first pellet smoker I've ever used so I'll be asking for lot's of help from you guy's. So far the cooker look's to be built really good. I inspected, vacuumed and clean all removable internal parts, and re-oiled the grates. I started it up and let it run at 350 for a little over and hour, then let it cool completely down. The unit ran just fine. I have a couple of questions. I compete in Q'ing and really depend upon internal meat temps to tell me when it's time to start feeling for doneness. I did not order any probe ports as those shown as accessories appear to have a small inside diameter. I'd like to know if they are really functional and if Yoder makes a larger probe port for the 1500 like they have done for the new YS640's. Once I insert a probe into the meat (generally when wrapping) it's there to stay until the meat is ready for the next phase. So I need to be able to pull the meat from the smoker without having to remove the temp probes. The only way to do that is to unplug from the display unit and be able to pull the wire with plug end through the probe ports easily. (Wha-la, wires hanging out the cooker door). Secondly being an old stick burner I've always run pits with the exhaust stack wide open and use fire management for temp control. What function does the stack dampener do on the 1500? When or why do you need to close it down? Thanks for the help in advance.