Help Me Decide Where To Mount My Mids (REW Plots Included)

Just picked up a PSixU from Nick and need a little help deciding on mounting location for my mids. I'm not new to car audio but I am new to DSP tuning and REW.

I have piccolos in my pillars aimed at the opposite headrest (which I need to rewrap, I hate the material). Now I'm trying to figure out where/how to mount the MM3s to get the most out of them. I have an OEM dash location that I was planning to use so I took a couple measurements with a couple different orientations:

Dash = firing straight up at the windshield
Attachment 18658


Dash Up = slightly angled back towards the listener
Attachment 18659

Dash Up In = slightly back and slightly angled towards the center
Attachment 18660

Pillar = pillar
Attachment 18661

REW plots to follow...

All left mids:
Attachment 18662

L Dash Up Vs Dash Up In:
Attachment 18663


L Dash Up In vs Pillar:
Attachment 18664

All right mids:
Attachment 18665
Dash has a nasty dip at 1.2k

R Dash Up vs Dash Up In:
Attachment 18666
These look similar

R Dash Up In vs Pillar:
Attachment 18667
Pillar doesn't have the nasty dip at 1.2k

Hopefully I did the measurements right, they look reasonable.

Any suggestions would be welcome.