Melanie ....
Maybe I can be of some help? I'm not trying to be a know it all! I love your colors and the pattern is such a great choice. I quilted a quilt for a lady some time ago and I could not get it to lay right, later I found out she just cut the width for the border she wanted and stitched it to the sides and cut the length. Did you measure the width and the length? Some people take three measurements both ways.
I made a quilt for my husband years ago when I first started quilting, it look pretty much the same as yours. I picked it all apart, thinking I had forgot to square up my blocks...That still thing, that still didn't help! It was black on borders so I was able to hide the error by taking small darts and you can't tell. But it never did end up being a lovable quilt, the batting was wrong and it's like a moving pad... Ugly and not soft!
I hope your able to salvage your work, I showed the first picture you posted to several of my friends at our class last night and everybody loved your choice of colors. It doesn't matter how many years you quilt, or at least not for me... I always make some kind of mistake...
Happy Quilting.... You sure do work fast... I'm Mrs. Pokie, slow slow slow!