Moving the needle valve farther from the carb, and closer to the tank will not make adjustments "take longer" as the flow of fuel is immediately changed. Close the valve a little, and the flow will slow down, not wait to slow down dependent on the length of the fuel line, we are dealing with fluid here.
Just make sure when changing the position of the needle valve, you don't excessively lenghthen the fuel line's total distance.

Jetts