Set up your grill for indirect cooking with your Smoke X2 and your Billows BBQ Control Fan controlling the temperature. Heat to 425°F (218°C).
Pat your wings dry with paper towels and toss them with a liberal coating of the rub.
Place the wings on the grill over indirect heat and insert a 2.5" needle probe into one of them. Set the high-temp alarm for 175°F (79°C). Close the lid and cook.
When the high-temp alarm sounds, start putting groups of wings over the direct heat to sear and char. Close the lid for about a minute, then open it, flip them, and close it again.
Cycle in another group of wings until all have been seared and charred somewhat over direct heat.
Temp the wings with your Thermapen ONE. As each wing reaches a temperature of 175°F (79°C) or higher, remove them to a bowl. If any are still not up to temp, close the lid on them and allow them to cook more.
Melt the butter and lemon juice gently together. Pour it onto the wings and toss them.
Pile the wings on a platter and serve them up! Serve with more lemon wedges or slices to squeeze onto the wings according to taste.