Put a meat probe on the cooking surface and try different settings. I'll bet S is around 160F where your food would be. I have the same grill and use a probe to measure temperature instead of the AT reading
Re wireless. If the controller works like it's supposed to, why would you need to check it constantly.? Is rather have true control and no wireless than wireless and open loop.
I'm now an owner of a Green Mountain Daniel Boone (I still have the combo). Construction seems similar too the PB. The controller is insane. It lights fast, gets up to temperature fast, and with a food probe laying on the grate I get a temperature to within 5 degrees of the set temperature...
The gas side is very hot. I've sort of given up on the PID. I have one of the meat probes clamped inside and use that to monitor temperature. I had it set at 300 to cook some chicken Tuesday (warm out) to get about 240F where the chicken was. The ACT temperature went to 280 and stopped.
It seems to me that there isn't really a closed loop control at all. I got the same results from my test; meat probe and thermocouple about 30-50F cooler than what the grill says it is. I see no value in replacing the controllers until this is really fixed. In the meantime, Lowe's should...
I've had this a couple of weeks. I was able to get the pellet side up to 350 once, but have since given up using it to grill. Luckily, the gas side gets really hot and is the reason I'll keep it for now. So now I do a quick cook on my ribs on the gas side, then smoke on the pellet side...