122.45,
First of all, well done on noticing the problem, and trying to do something about it.
From your brief description, it sounds as if you're not using the ailerons correctly on the roll-out. You don't say which method of cross-wind landing you're using, but whether you're landing wing-low or de-crabbing, you will have some into-wind aileron when you actually land. As you slow, and the ailerons loose effectiveness, you will need to increase the ailerons until they are fully deflected.
Once the ailerons are fully deflected, you might find that in some types, in some cross-winds, you still need to use the brakes to steer. I don't know the Jodel family at all, so I don't know if they fall into this category or not - maybe someone else will be able to say for sure?
As for wheel-landings, I would suggest you get a good instructor to do enough of them with you that you can be confident of them. As soon as the wheels touch, move the stick forward just a tiny amount. Once you've done that, it's simply a matter of doing whatever you need to do to ensure that the attitude remains the same. That way, the wings will not be producing enough lift to counteract your weight. If you bounce due to a bump in the ground after landing (I think this is what you're afraid of, have I got that right?), maintain the attitude and the angle of attack will not change significantly unless it's a really bad bounce (in which case you can go around) and so the aircraft will simply settle back onto the ground again exactly the same way as it would during a 3-pointer (when the wings aren't producing enough lift to keep the aircraft in the air because they are stalled).
All of this sounds like it could be cleared up with just an hour or two with an experienced tail-wheel instructor. Make sure you instructor really does know how to fly tail-draggers properly, though.
I fall into the category that has ground-looped, although it was helped by a wing clipping the crops at the side of the runway. Yes it did damage the aircraft. But even so, I still believe that it's possible to have a long tail-dragging career without groundlooping, as long as you remain constantly on the ball when on or close to the ground, and make sure you respect your aircraft. Do as I say, not as I do!
FFF
-----------------