I fly on tarmac (abandoned airport) and my experience is that with CG at 115mm and struts raked slightly forward (2mm shim on rear retract beam) it will not nose over IF it tracks straight.
It WILL nose over as a result of a ground loop especially on take off if I am not quick on the rudder. As the prop spools up and the plane starts to pick up speed, there is a certain moment during the take-off roll when it will viciously pull left. With anticipation and swift rudder input I've managed to overcome it, it did take some practice and a few broken props [:@]

This is very scale behaviour as full size 109s had this tendency.