Gavin,
these motorcycles are designed to run the modern fat tyres that they come with as standard.
As for what to put on, judging by what you have said about how you ride and so on.
My recommendation would be one of three choices:
Avon Azaro ST 45/46
Metzeler Z6
Continental Road Attack.
There are others but these seem to be the most popular sports touring tyres on this forum at least.
They all offer good handling characteristics and good grip. Particularly the Avons and the Metzeler Z6 in all weathers.
And good wear also.
My opinion anyway others may think other donuts are better but this is based on my own experience over a long time using different tyres. Most riders in this forum favour the above tyres.
Davem