Did you ever try the Metzeler Roadtec 01?
They have been the best sport touring tyres I’ve tried (not talking about mileage as I actually didn’t run them till the end as I eventually traded the bike)
What type of rider are you if I may ask? Only asking because of the +6000 miles on a set of tyres, for example, I commute in the city about 80/90% of the tyre lifespan so I know that may reduce as much as 30% if it’s use if I were to only tour with them.