wrote
We are going to drop using the shunt feed tower no matter how hard we
work on it we don't think it's going to work any better that it does
right now.

We have two choices : etc
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A quick look with NEC shows the tee with the 90 ft vertical section to
have -5 dBi h-plane gain, and the tee with the 150 ft vertical section to
have -2.1 dBi gain, when both using a 2 ohm coil resistance and a 25 ohm r-f
ground. So other things equal, the taller vertical with the shorter
horizontal wire will give better performance.

Adding wires in parallel will improve r-f bandwidth, but will not change the
gains significantly.

BUT if the supporting towers are good conductors they will act as
parasitics, and the azimuth patterns will not be truly omnidirectional, nor
will a deep null exist toward the zenith. These may be factors to consider
for this application.

RF