Put an APC 12x4 on it. Its the perfect prop for the TT Pro 46. It should end up turning around 12,800 rpm on the ground, and you'll end up with unlimited vertical. Its the way I've been running my TT Pro 46 for three years. I also run an OS A3 glow plug with Omega 15.

As for the bearings, take off the back plate and inspect the rear bearing. You should be able to see it without removing anything else. If the cage is starting to fail, it will be very obvious. You may not have any visible particles in the piston, but small particles will cause premature failure of the glow element. The first indication I had of imminent bearing failure a month ago was two burned out glow plugs in two flights.

Brad