I've got the 25e and the 60. I think H9 is very conservative on the CG recommendations. I ended by balancing my 60 about 1/4" aft of the rear most recommended point, and the 25 about 1/8". Neither have the nose over tendency (with the stock gear) that everyone talks about. They both still have a fair amount of up elevator trim for level flight, so I'm thinking the CG could go even further aft. (They both recover from spins when the controls are released.)

I suspect the 120 is no different.