I just read the whole thread and I do not have much to add as most have hit it right on the money.

I taught unusual attitudes/acro for a few hundred+ hours and although you have done a spin everyone is right in saying that you are FAR from proficient in spins and spin recoveries to the point where you can scare the hell out of a friend.

As yourself these questions:
-How will the aircraft react in a spin with an aft CG? How will the recovery differ if at all?
-Same question for a forward CG
-If I enter a spin from the top of a loop and am upside down is it an inverted spin? How would you recover?
-If you are in a steep turn to the left and enter an accelerated stall in a slip which way will the aircraft spin, how will it react and how will you recover?
-What about a steep turn to the left in a accelerated stall skid situation?
-The airplane is spinning and it starts to flatten out, what do you do?

Just some things to think about that there is far more to a spin than a simple 1 G straight ahead power off entry.

So, get a QUALIFIED instructor and get out there and get actually proficient and have some fun!