I'm sorry what is 1/2 caster progression because it sounds like spell increase every other lvl but I read threads that say the AA would benefit from 1/2 caster progression and I'm thinking that would nerf it more.
Please clarify.
Caster Level and Caster Progression mean different things.
Caster Level is usually equal to your class level in a spellcasting class. Sometimes, as in the case of the ranger and paladin, it is equal your level in a class minus some number.
Caster Progression usually means how fast a spellcasting class gets spells. Wizards, Druids, and Clerics have full progression. They get spells as fast as possible. People like Bards and Magi get 3/4 progressions and end up being able to only cast level 6 spells. The progressions aren't that standardized though; the sorcerer has to wait an extra level to get to the next level of spell than the wizard does, but is basically a full caster otherwise.
Edit: By "get" spells, I mean get access to them and slots to cast them.