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Sounds lovely, but what counts is the SWR that the amp is seeing. That is the important one to go for. Keep fiddling the coax length till it comes down. Sounds like you have tuned the V quad and the coax instead of just the V quad.

There is only one way out of it from here. Put the swr meter at the antenna and re tune. Best way is stand the antenna on the ground in the clear on the reflector with the beam facing the sky. Dont stand too close to the beam when checking the swr. You can have any length of coax running back to the radio but the SWR meter must be an inch or two from the beam. Another option is to work out the velocity factor of your coax and put the meter exactly an electrical half wave from the antenna. 

From here on everytime you change something your SWR will change.

Just because a meter 6ft down the coax is showing a low swr does not mean the amp or radio is seeing the same low SWR. You need to retune your quad properly.