ORIGINAL: jester_s1
Based on the manual for his plane his CG setting is toward the front of their recommended range. That's assuming of course that the measurement was done right and Hangar 9 did their calculations right (I don't doubt them). It could well be though that H9 is recommending a starting CG that is nose heavy to be safe, and expecting some fliers to like the stability and the wind handling.
If the CG is at 70mm, then it is in the middle of the range. The range is only 1/2" wide. He in fact did move the CG back... and liked the way the plane flew but doing so created landing problems of which there are two ways to read what he said. One way indicates that he was experiencing too great of elevator authority and thus was near the stability limit for moving the CG aft. The other is that the tail weight caused porpoising typical when having mains too far forward. I don't know which reading is correct. If the former... then he approached the stability point without curing the up trim problem.
Lacking was a report that the up trim was relieved when the CG was back.