As asked in your other thread of the same name, how much total rudder throw do you have? You really need 45 degs or better. KWJ48's question is good, if you are too far forward on the CG it will behave this way. Do a vertical upline with the canopy facing you, wings perpendicular to your line of sight, and see if yaws to the left. If so you need some more right thrust as others have suggested. I have moved the thrust angle in my 50cc Extra and it makes a difference flying but not much when hovering. I've moved it between 0 and 4 degs and when hovering I won't say you can't feel it but it's not difficult to hold in a hover with it at zero or 4 degs. Certainly not enough change as to make it hard to hold. On the 50cc, CG affects it more in a hover than anything else but I do have 48 degs of rudder, 46 degs of elevator, and 39 degs of aileron travel so controlling the tail in a hover isn't an issue with that much throw. In the picture I've posted here the thrust angle is 0-0.