Hi
Not sure where my cg is exactly. Like you I set my cg as to how the plane feels to me, but I will be surprised if it is any more forward than 180mm.
I am flying the stock Hacker set up on 8s 5000mAh cells. The battery back is as far back as i can get it. The Rx battery is sitting on a platform above the rudder servo. It needs about 3mm of up elevator to get it to fly straight and level. No idea how she flies inverted as i didnt get the time to explore the envelope.

Mike