This is interesting since I got my Abrams days after yours from the same place and it curves beautifully with the Taigen V2 3:1 gears in it. I didn't really run it enough on the nylons to form an opinion. My guess is the bigger the tank and slower the gears, the more it hides the twitchiness of the HL electronics. Obviously 4:1 gears curve all day long since you have to floor them just to get the tank to move.