Hey SuperKar,
If it helps at all i got 5 7 8. Having the horizon roll is just like being in a real aircraft, it shouldn't throw you out that much. You have to be gentle, input, neutral, remove (stop) input...repeat.
If you move the control like your in air to air combat then you'll struggle to stay in the boxes, think 2 boxes ahead, and think how your going to get the plane to that box smoothly.
Latest pilot jobs has a good exercise for it, not exact but not bad.
Good luck.