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I had another look at this one Carlos. Its really quite good. But I think to get beyond this standard you'll have to go Polarie and go longer and perhaps try a slightly lower ISO and boost it as needed in Lightroom after. But it has an overly stretched aspect that comes from not enough signal.
So your choices are wider lens (I am assuming this was F2.8 and there is no more to gain from a faster lens - they usually have coma), longer (Polarie and use an L bracket to get some of the angles on your camera).
Try 90 to 150 seconds per panel at F2.8 and ISO2000 or 3200 (you're using a 5D3 right?). Now take a second set of shots with Polarie off of the landscape. You can layer them in once you've stitched your sky.
If your lens comas in the corners then do F4.
It should avoid that overstretched look, increase colour saturation and make your image more robust to post processing.
Don't worry about rotation its not an issue. I have done several 18-32 image mosaics taken over 40 minutes or longer and it was no problem for the stitching software - besides, its being tracked by Polarie anyway right? Try to move your camera forward in the L mounting bracket so its closer to the lens aperture - that is the "nodal point" or the point where there is no parallac error on a camera and it will reduce parallax as well which should give less elongated stars above the MW (you don't have any in this image but they occur pretty easily).
Greg.
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