John Ferrell wrote:
I really don't know why there is more TVI with a high swr. But my
experience has been that there is, especially on 6 meters.

SWR can have an indirect effect on common-mode currents by causing
a malfunction of the balun. For an SWR of 1:1, the balun is probably
functioning in the impedance environment for which it was designed.
That balun may cease to choke properly when exposed to the impedances
present in an SWR 1:1 environment and allow more common-mode signals
to develop and radiate.
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73, Cecil http://www.qsl.net/w5dxp