Mikes suggestion was the best - fix the antenna. The golden rule of
consulting is to give the customer advice they can perform. You are
limited to coax and they all had twin lead answers. Mike's suggestion
of making multiple dipoles AKA fan dipole is the simplest and quickest
(just make sure that you drop the ends away from each run by one to
two feet - the fan).

This is the approach that I'm taking,
6 and 20m dipoles up now with balun, and more as I have time/inclination.

Me, I like the antenna to do the radiating, not the feedline.