Ran mine this weekend and VERY impressed. I ended up with the grp 2053 and it gave me plenty of power with pretty good runtimes. I ran the motor a little on the fat side and could go 10:30 so in the main I pitted at 9 just to safe. Tons of top end and great bottom end to go with it. Only needle that really seemed touchy was the idle screw and I can definitly live with that.
I have the 2013 ordered and we'll see what that does.
P3 plug
Grp 2053
Carbons shoes with 1.0 springs
Stock 7MM carb restrictor
And 30 percent fuel
That's what I ended with this weekend