First thing is where have you measeured the SWR?
Swcond thing is NEVER tune the rings until you know what the SWR is.
The best way to check the SWR is to connect (f Possible) the swr to the antenna directly or as short s patch lead as possible.
The reading at the radio ens will be different...its what is at the antenna that counts.
Is it possible to ground the radio in the house?
If there is and SWR on the cable then it will read differently on a different lenght...its a wave after all.
If all else fails...stich a tuner / matcher in line to flatline the swr to the radio / finals see a good match
