bigger DS bikes and thumpers are really different when it comes to tires. knob size and rubber compound really make a difference. TKC 80's are very popular with the big bikes and filter down to the thumpers alot, what makes them good for the big bike takes away from the thumpers, namely the big tread blocks, with the thumper you can run a more agressive tread pattern and get similar tarmac results with much better off road performance.
so keeping that in mind.
i tried the very popular TKC 80's on my KTM 640A and they were a good all around tire, very neutral on and off road.
i switched to MICHELIN BAJA'S and they were amazingly better off road, and still stable with predictable manners on the road.
i then tried a set of DUNLOP 908'S, pretty much the same story as the michelin's, very good off road with predictable on road manners and it adds a few miles in longevity bacause of the center tread design. the 908 is my favorite tire thus far.
i have run many tires and to be honest, when you get into the dual sport DOT range for a thumper like yours, there is not too much difference between the popular tires, they are popular for a reason.
this is one of those things where you can start with what works for the masses, and then through riding exp. you'll find what works better for you, your area, and your bike. you really cant go wrong with any of the tires mentioned here.