A couple of things:
1. Analyzing the data from a season of your own league games will not give you anywhere near the sample size to conclusively say much of anything. If you want to do this, you'll need to figure out a way to crowdsource.
2. Looking at box scores will get you nowhere, as shotblocking also alters shots.
(125704.72) You will need Moutlinho's game analyzer to create any sort of rigorous study on the effect of shotblocking.
(100218.2)Good luck though! This idea is an interesting one for sure.