Hey Buzzy, did you get you problem solved?
One quarter turn is a lot on a needle valve, I turn mine in increments of 1/16 or even less.
You might want to watch your flame as you turn your valve and watch how much it increases with a 1/4 turn.
Just thinking..., you have a 25° temp drop, how about preheating 25° hotter before you load the smoker, you will also lose heat from the door being open, but your needle valve will be adjusted at your target temp of 130° taking into consideration the time for the meat to reach target temp, then as the meat heats up the cabinet temp will rise to 155° and you will be at a good smoking temp, requiring just a slight nudge of the valve to go a little higher.
Gene