Thanks for your answers and sorry for the delay but i left suddenly for holidays.

Yesterday i went to fly it again, but before disabled at all the vertical tail servo.
The take-off was normal and during the fly it had some nose up which tuned of the transmitter and it was flying straight, but again looks like its tail-heavy.

This time i had 1km range and the time for one deposit, again things wasnt easy, as i had the throttle to about 1/3 it was still flying very fast and finally crashed with the nose down and broked the firewall.

Worked last night and repaired it...
Wondering if i can make it fly more slow and much more stable than this, in flight simulators have seen that flaps do that, is possible to add some kind of these?

Something very good is that the engine problems has finished for good, easy start, good idle and it doesnt turning off.

Also its the right way for a beginner to fly it with the wings servos or is better try with the vertical tail for left-right?
I prefer for this start not using both of them and making it more confusing.