As someone who micromanages the minor leagues, I want to propose expanding AAA rosters to 35.
Because injuries to both the ML and AAA rosters affect the AAA squad, it would be nice to have a little more cushion at that level. At one point I was down to 2 OF in AAA even though my AAA roster has 6, because I had 2 hurt in the majors and 2 hurt in AAA. Calling up players from AA is one solution, but I don't like calling up players to AAA that aren't ready.
30 in AA is fine, since AA injuries affect only AA.