I think Al's switch to playing more 4, post the monroe signing, has had some unforeseen consequences.
I can see why he wants to play PF, given he is an undersized center. However, he is getting less open looks from 3 at PF vs C. Theoretically, he can post more effectively at the 4 - but Al is really not much of a post player so the uplift in post scoring is less impactful than the decrease in 3 pt opportunities.