Maybe go with more borders but not pieced ones. Or perhaps the next border a border that "reads" solid & the next one a pieced border. Also, remember that the borders don't have to be the same width on both sides. So if you want the quilt longer but not wider, just put a wider border on the top & bottom to make it longer.
I really like pieced borders & here's a site that shows a few for some ideas that might help you.
http://blog.shopmartingale.com/quilt...ed-border-fit/