Jon

As you already know, wing loading has a tremendous impact on the way a plane flys. A plane with a lower wing loading will always fly better and more responsive that the same plane with a higher loading.

I'm thinking that the ZDZ 60 isn't all that is adding the extra weight to the plane. What else may have been added that could be removed to reduce the weight? I also have one of the 300S planes with a Brison 3.2 that comes in at 17-1/2 pounds (second release) and it flys great! There is some wing rock in Harriers but I've never takern the time or the bother to laterally balance it completely. As far as stalling is concerend, if I don't try to pull 90 degree turns at high speeds, or the same turn at too slow a speed, it's almost impossible to stall with a reasonable C/G. BTW, the difference in the all up wieght between a DA50 and a Brison 3.2 is only about 6 ounces.

Your ZDZ 60 (as the only factor) would have to weigh in somewhere around 6 pounds or more to have gained the extra weight your plane is carrying. If it does weigh that much you would be wise to sell it. I've got a 105 that weighs less than that

Regarding C/F products, the only one I would bother with would be the main wing tube. Try your C/G at 3-1/2" back fron the L/E at the tips to see if that helps some. The Extra likes that location as a good starting point. More to the front and it's more sensitive to stalls.