I've added another border then trimmed the whole thing to the size I wanted. I used a bunch of cheater blocks for a quilt and once finished it wasn't noticeable.

I would wash the panel - see how it wanted to be - and then work with it the way it is. Trim it, put different borders on it -

I am Not an advocate of blocking.

The only fabrics I will try to "re-align" are woven plaids and all over prints.

I have also learned to check to see if the printing is following the grain lines.

Thank you all so much for your replies and tips! Seems like a project that was supposed to be an easy and quick one turns out to be quite a little hassle.

Panels are mostly not printed straight, they look really easy but by the time you figure what "fudging" you need to do this time, it's not for the faint of heart. I still use them, mostly the holiday ones, they change with the seasons and I'm sure I notice that it's crooked but no one has ever mentioned it. It's more obvious to the quilter.