The only thing I could think of - and have no idea of whether it would work or not -
Center each border - and then "piece in" whatever would be necessary at the corners to make it work.
or
On the border(s) that are "short/skimpy" - resew them in several places with a slightly smaller seam allowance and you might be able to "recover" that inch? But I don't know if that would mess up the points.
Interesting/attractive border, by the way.