I have exactly the same issue. All aircraft seem to want to turn to the right, however, it seems more of a rudder induced turn than an aileron one. I have to fly with a constant pressure on the stick - to the left and with some left rudder input.
You can trim the rudder to lessen this effect but the aircraft flies unclean like that and you skid/sideslip too much for comfort, that's unless you're in a 109
I have re-calibrated my stick 3 times and it appears to be ok - also, I've checked that my key mappings are correct and everything is neutral.