Good ideas, THANKS!!

I did double check the balance and it balanced according to the book. I have the great planes balance machine which is worth its weight in gold. So I can rule out the nose/tail heavy situation. I'll try moving down to a 11 X 6 prop. The only reason I used a 12 X 6 prop was that the book said that was what they tested with. But...since they have far more experience than I do, I'll try the less aggressive prop. What is the differences in numbers? Is the diameter smaller the less speed and the smaller the pitch the less torque?