I haven’t seen the 120 version, I have the 60 kit version. that was a little tale heavy but shifting the radio and battery equipment forward did the trick for that. if the tale section in the arf is made like the kit there isn’t much to chop up back there, mine is a built up tale group. the fuse already has lightning holes in it top bottom and sides. I even added the triangle stock to the vertical stabilizer and mine came out almost right. I set mine up as a tricycle gear. the only suggestion I could make is maybe shifting your engine forward on the motor mount and trying to get the radio gear shifted forward as much as you can. the fuse on the tiger 60 is very long and a little added weight at the tale can account for a lot, you might try adding a heavy spinner washer also. for some reason every arf I have purchased always came out tale heavy. I had a super stick that came out heavy like that and had to shift the motor way out front it looks funny but worked out good, if I hadn’t shifter the motor I would have had to add almost 11 oz to the front. you might even try to add heavier/larger wheels.