Dear jake,
I was looking into your circuit and i am noticing that you have very less current in the output branch. It is about 0.1u A. Is it right? I mean, that will cause a lot of thermal noise at the output. And another thing. The W/L aspect ratio of the input differential pair on the output amp is comparitively low. This will affect the relative noise in terms of gm. I would suggest that the gm of the differential pair be higher than the current mirrors for better noise performance. Finally, the lengths of the devices are a bit high, why dont you reduce them a little bit. It will give rise to a lot of unwanted parasitics...... I hope that I am clear on this.