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Ok, do this. For now don't worry about the swr between the radio and amp. Install the amp in-line and the swr meter after the amp.  With the amp turned off but still inline check the swr with a steady carrier.  Now turn the amp on and do the same test.  If  the swr jumps at the higher power levels you probably have an issue with your rg-58 coax, feedpoint or connections.  This is only going to be a guess since you are not doing any testing into a known good dummy load.