Lets focus on what you have right now.

The Edge 120 with the Moki 135 should be able to hover the easiest. You to should use a large diameter flat pitch prop perferably with a wide blade. The moki 135 has almost the same amount of power as the OS 1.60 FX. You should try the 18x6W APC or 17x6 APC on this plane. This will greatly increase the thrust of this engine. The inline design of the Edge should lock the edge in for the elevator but you will have to make corrections for the elevator. Use about 3" of throw for the elevator and 4 1/2" for the rudder for 3D. Some expo (50% on 3d rates) should help keep the plane somewhat docile. A more rearward CG also helps. To the guy using the US35 bad idea. Too heavy with too little output. Too heavy of a plane is the biggest mistake in trying to do 3D. Keep this plane around 11 to 12 pounds for 3D.

With the 1/3 scale Pitts Special using the Fugi 50 you should be thinking about a 22x8 or a 22x10 Menz Standard prop. This plane has a short tail moment and therefore less time to make corrections in a hover making it harder. The Pitts Special is not really a 3D plane but it is capable of torque rolling.

On the Ultimate Bipe use a 17x6 or a 16x8 APC.

One of the best combos I have seen in action in the 120 size is the Dave Patrick Ultimate Bipe w/YS140. This plane was using a 17x8 APC and has just the right balance of power and light weight to perform 3D well.