i have a player who have proficient inside defense and strong shot blocking... good enough to be a consistent shot blocker (i thought that he should have at least 1.2 blocks per game)
yet he averaged 0.9 blocks per game. which is i think it's too low for a player with those types of skills...
Shot blocking always depends of the opponent player/team and his/their skills (jumpshot, range, insideshot), so if you look at your outside- and insidedefense ratings against your opponent you can see why you do not make so much block shots (in the moment)!
Apart from that, the most block shots which I saw in BB were block shots aginst players which try to shoot from the outside like 3P or far FG, so maybe you should train some range and outside defense!?
I dont know your player skills but thats my experience...