It was very common back in the day to have the CG too far forward. Many of us ( myself included ) had it beat into our heads that a forward CG was more stable. Not entirely true but not entirely false either. What the forward CG does is mandate some up trim. On the plus side that up trim would help self correct if you started to build too much speed in a shallow dive. On the negitive side it also ment that the pitch trim would only be correct at one given airspeed and while using excessive elevator throw to compensate you can cause a nasty tip stall. Moving the CG back compensates for the drifting pitch trim some. With some fiddling between CG and downthrust you can almost eliminate it completely. All depends on what your preferences would be. I would personally set the CG to 30% and elevator throw to around 15 degrees.