Many thanks for everyone's input/advice. The general consensus of opinion is; keep the SME IV. Good advice, which I plan to take. The suggestion to replace my Clearaudio Maestro V2 Ebony MM cartridge with a Soundsmith Voice MI cartridge is interesting, will follow up on this.
I recently purchased the Analouge Productions UHQR The Doors LA Woman disc. I honestly don’t know how a 53 year old recording can sound this good on a 33 1/3 vinyl disc, simply mind blowing! Surface noise was non existent, dynamic range was outstanding as was frequency response. Overall, the best vinyl pressing I have ever heard. Also worth mentioning, packaging and associated printed material for the new disc is simply outstanding, as good as it gets IMHO