I gots no clue about the above couple of posts....
The general rule in seating position is; About a fists width between your crotch and the tank, then adjust as needed. Don't need to be all the way forward, nor all the way back. It's basically far enough back or far enough forward to get your knee under the lip of the tank, not that the 250 has much of a lip anyway. So you got to take advantage of what little there is. It's different for everyone.
There is a sweet spot for your bum in the seat & body on the bike. You will know it when you feel it, everything feels much, much better. Experiment around to find it. If you can find it, everything else follows more easily.