Mario, unfortunately don't have that much experience on the MX, went solo on a trike, still busy with a conversion. I think Henni is the person to give the advice, he has a couple of hundred hours on the Quicksilver.
Not sure how accurate our airspeed indicator is, we watch the RPM counter more. We climb at about 6500RPM, cruise at 5 500, then reduce power to about 3 500RPM on the final approach and round out. The MXII cruises at about 40MPH and stalls at about 27MPH which doesn't give you a big range. It survived a couple of 'crash landings'

during training.
Landing any plane is a matter of practice, you have to get your eye in and get the feel of the plane. I remember battling on the trike as well - I took quite a few hours to learn to land.
Our MXII hardly needs any input from the stick flying straight and level when its trimmed right. Entry to the turn is interesting, but once an angle of bank is established, it seems to stay there. Do you fly with the spoilerons (pedals)? We have disconnected ours and I see our POH recommends initial training without them.
Taxiing is another scenario altogether, since the front wheel does not steer.
Finally, my partner in the MXII is a CPL with over a 1000hrs, including on the King Air, and he thoroughly enjoys the little plane.
Good luck with your training, just hang in there and remember the more often you fly, the quicker it all comes together.