The border is too big in proportion to the centre of the quilt. I would break it up by making two extra borders with dividing sashes as well. The next border can be a thin one, with two sashes and then put your final border and binding on. The borders shouls not dominate or detract from the centre in my opinion. It might be helpful to look at Janet Kime's book, The Border Workbook, ISBN 1-56477-184-9, PUBLISHED IN 1997.
It has many ideas and good instructions for easily pieced borders and paper pieced borders.