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Might want to stick a dummy load at the end of your coax, like where the antenna mounts at.  Check for any issues starting from there back.

Or vise versa.  Stick the dummy load at the back of the radio ad well to make sure all is good out of the radio.  You will need to have an swr meter obviously when doing this, so connect dummy load directly to ant port of swr meter.  And make sure to use same jumpers as if you had a meter in line and using.  Hope this makes sense.  But starting at the end of the coax, using a radio and swr meter, and a cheap radio, just check VSWR first.  Then go from there, replacing radio and such with your mfj meter from radio to where antenna mounts at.  If possible, place dummy load onto the mount itself.  That is the end point and if possible should be the start point for s dummy load. 

At any rate, hope you get it resolved.  Good day.