extremely soft 2nd to 3rd shift

I'm wondering if the transmission just needs a simple band adjustment? Because it has been about a year and 5 months since it was re-built and it has not had the bands adjusted.... I did however drop the pan and put a new filter on about 2 months ago and i while i was down there i backed out the line pressure screw 1 full turn wich i read one complete turn of the adjusting screw raises closed throttle pressure by 1 2/3 psi.
Should i drop the pan and adjust the bands and turn that line pressure screw out one more turn?