As the author of this thread, I thought it would be appropriate to post my end results for future readers.
I have removed the entire radio, coax and antenna for testing then re installed it with the same coax and antenna and it now works so clear on the unicom frequency I had problems with before, I have not tested the entire band but it is already sounding soooo great and not sure what the issue was.
Currently my SWR is still between 1.8 and 2.2 with good RX and TX with power output of 5-6 watts (So SWR was not the cause)
I did find a badly bent female centre pin coax connection on the back of the radio which could have caused it, although a dummy load showed swr 1.02
Adjusted my mic setting on my headset to minimum
I have got a radio check in the air from 30nm away 5x5. I am glad the problem is resolved but bit disappointed that i couldn't pinpoint the fault....and that I cut my antenna
Thanks to everyone for replying with great insight to this topic, I am sure we will help out many future readers to come.
AJ