I had a Superstar that was gas. It had the engine mount on the front for tricycle gear.
I coverted that plane to a tail dragger. It attaches directly to the fuse. Hard to explain, I will send a picture from a website and mine.
I believe that plane is sturdy enough to cut out a space for the servo in the fuse on one side or the other. Beef up the wood on the inside with strips for the screws and ad whatever wood so that it will not break the fuse side panel. If you do this place a servo in different places so you do not exceed the center of gravity range suggested. You can always add a little weight to the nose. However you want to keep it light as possible and especially so being electric. I do not think one servo is going to make much difference. Mine was a rather sturdy and heavy plane compared to my others.
Might ask this question in the build forum where they know more than I do.
Mine had a place for a servo and I simply ran a tube out. I suspect your battery sits where my servo tray was.
I am not sure why its torque steering so. I guess it gets over it once it gains speed. I would think prop size and thrust but that plane is a beginner ARF plane and thrust should be set. I have a high opinion of Hobbico. I assume you are using the suggested prop.
All past tense, I flew it into a tree that was further away the lap before.

Its just a thought. I very much like being able to taxi my planes and I too must correct as I take off with some of my planes spinning big wide props.
I have one 40 size I must toss and I stress each time when I am by myself. TX in one hand, plane in the other. Its a motor driven glider with no wheel at all.