5 degrees offset to the right? Far to much usually.
All planes, especially taildraggers will yaw to the left as soon as the tailwhell lifts. Some more than others. This has nothing to do with the right offset/thrust of the engine!
Most RC pilots don`t know how to do a perfect takeoff with taildraggers. The trick is to add a small amount of down elevator early in the takeoff to raise the tailwhell, thus redicing the sudden yaw to the left. If the tail is lifted early the yaw will be softer and easier to control.
Right thrust is something which have to be adjusted doing a lot of trimming during flight. And of course everything have to be as perfect as possible first; no warped wings, proper CG, lateral balance, taped rudders and so on and so on.
95% of model pilots never try to optimize their planes after first flights, thus they never learn how well a plane really could fly How many pilots do tweak for optimal CG suiting their flying style???