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As always, I am the bearer of shit. You MAY have a defective tyre. This will prove very difficult to sort out with the dealer and the tyre manufacturer. Good luck.
If you have found a suitable pressure which works, good job. If not, you may have a defective tyre. Getting it replaced will prove difficult. I am speaking from personal experience.
The positive - I did get a new tyre. The ‘negative’ whilst I was waiting for the matter to be resolved, I ordered a new bike!
Good luck and stay safe - do not take chances with tyres!
All reassuring. This and the conversations with dealerships.