I decided that the AHRS to GRT spacing was pretty tight. I decided to move it forward 1/2" to give more room to service the pitot static lines. I also wanted to move the FastStack hub forward - the cables were a little snug. This will give it a better fit.
It was a bear to remove and replace the mounting screws, but with long forceps I was able to get it done.
I also put in the elbows for all of the pitot static lines.