RE: What fuel should I use?
If you haven't run it yet, break it in according to the Saito instructions. I have the .72 and a couple of .91s and all 3 run great. I ran 2 gallons of Omega 10% castor blend through each, a half gallon on the bench by their instructions and the rest in the air. Then I switched to 20% Cool Power heli blend. The Saitos seem to like more nitro and take a longer time to break in than OS or Magnum 4-strokes.
If you start off with synthetic, the ring has a harder time seating. You want the initial wear so the ring will seat-fit smoothly with the cylinder. After it seats well, the compression seal will increase.