Bridgestone BT45 Battleax are available in 100/80/17 & 130/70/18
https://www.bridgestone.co.uk/motorcycle-tyres/battlax/bt-45/a-closer-look/

Anyone any experience with running BT45's ?

Or for something more track oriented you could maybe take a look at Avon AM22/23's, they were period track rubber back in the day.