I went back and did the calculations and when Tyreke began the year as a pg (first 29 games), he had a shooting percentage of .413. Based on his annual shooting percentage (and because I don't want to do the work to figure out his post pg shooting), it looks like his shooting percentage was far higher after the position change than before.
Umm this has been said many times. Reason behind it? Well, Tyreke taking less shots, an improved jumpshot, getting a lot of his touches only in transition/ when he cuts and is wide open for layups. Part improvement/maturity from him and part him not being given the ball to create his own shot.