I could get mine to flat spin. Since my plane is in three peices I cant check my CG, but I believe I was flying with it at about 5 1/4. I had it back around 6 and didnt like the way the plane flew as much. I could hover great and do blenders and flat spins at 5 1/4. The easiest entry to flat spin for me is the blender. I kill throttle, head straight down, left aileron to get the spin, then Right rudder and Down elevator. (Down elevator as in you push up which normally makes the plane go down. Just in case, i told someone that at the field and he pulled the stick down and it didnt work)

Now at this point my plane is not flat, close but not flat so I start to **** the aileron to the right to a little past right of center and it locks in, thats when I start to increase throttle and it stops dead in its tracks and spins. Although I cant get it to stay there for more than a few revs once I get it to stop dropping.

There is a good article in Fly RC about Flat Spins, If you dont get Fly RC think you can check it out over a cup of coffee at Barnes and Noble. Of Course your LHS should have it too, but they dont usually have good coffee.