This post is extremely simple.
The monk AC bonus is curently +1/+2/+3/+4. I think it should be changed to +5%/+10%/+15%/+20% to better fit the new AC system.
Monks and Fighters with good gear/stats should be on par AC wise, and currently it's not that way. So I think armor bonuses should be increased a little for higher level gear like the planeforged armors.
Just an idea, I know monks make up a bit with Dodge bonuses but still, fighters get more PRR so I think AC is the in-between and if a fighter can reach 200 AC and a monk caps around 90s, monks should get some changes to their gear/and AC bonuses to be closer to a fighter for those who work on their AC