... an SWR above 1:1 at the balun is what causes the 22ft. feed line section to radiate which
provides the enhancement to low angle radiation.
This statement indicates a misunderstanding of how transmission lines work.
The radiation from the vertical section has nothing to do with the SWR at that point.
It is possible to have a perfect SWR and still have the line radiating, or have a high
SWR with no radiation.
The radiation is because the shield of the coax cable is connected to one side of
the antenna - either directly or through a voltage balun that doesn't do a good job
of isolating it. Because of that connection the outside of the coax IS a part of the
antenna. How much current flows on it will depend on what else is connected to
the feedpoint, and what impedance the short wire presents compared to the others.
All that, of course, affects the load impedance, and thus can affect the SWR.
But you'd expect that - there are, in effect, 3 wires connected to the feedpoint
and you are changing one of them, so of course the SWR may change.
Whether the radiation from that section of the feedline really improves the low
angle radiation is a different matter: it's probably best to treat that as an
invention of the advertising department.