Improper 4x5 C-41 Development?

I have a question and thought your digital expertise would be able to answer it.

 

I'm starting to wonder if the development of my local lab is not so good because

of the color gradation in the skies of my scans.. any thoughts? See the density

and color shift towards the lower and upper corners? What's your take? Improper

development and agitation by my lab?

 

Needless to say, it is disappointing if it's improper development!

 

Thanks.

 

<img src=http://farm1.static.flickr.com/193/510869817_533588a15e.jpg?v=0>

I'm assuming the white around the edges is a border right?....c-41 unexposed areas stay that blank orange=black on a print(or positive scan)

I think we need to see better examples. The sky looks fine.

 

What lens are you using, and with what movements?

 

Keith