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RD My Imax had a s/s top whip section. .Can't do any further testing with the imax sold it

 Thought your testing  might shed some light on the subject.

 You use yours for portable use I believe on a f/glass pole.Maybe you need the first 9ft of cable as a counterpoise?

 Anyway like I said if the choke is changing the swr( especially as bad as you state) You definitely have a problem with the coax radiating . The adverse affects are increased noise pickup and pattern degradation.

  Now whats causing it, how bad it is and if you notice it or not are open to speculation.