I have the same plane,, I love it!!! First let me say that I dont know how you have it set up but I will start with this. Mine came with a engine mount that was an inch short. 4 and 5/8ths and the book says 5 and 5/8ths. 5 and 5/8th's is what you need. Anyway, you'll have lots of probs if you used the same mount they me. I have a 46fx in mine set at 2 degrees right thrust, bigger wheels and stronger tail wheel assembly. That's it!! I still add a little right rudder to it when I smash the gas but if I slowly give her gas to about 3/4 throttle she tracks decent,but not perfect. 4 seconds to reach 3/4 throttle. This is what worked for me, on grass. asphalt seems to make the plane veer harder to the left.
Also, I ignored the directions on setting the control throws. Here is what I used: ELEVATOR:1/2" up and down, AILERONS: 5/16" up and down,RUDDER: 1"left/right.
It sounds to me that you may have a cg problem or the plane isnt trimmed out.
Join a club!!! There are plenty of good people there that would be happy to help you out.
When I 1st started flying, I tried on my own and went through 4 planes before I joined a club.
This is what worked for me on this plane. I love to fly this plane because it is a great flier. and a good looker!!