14X8 is the prop for the saito 1.00, NOT the .82. A 13X7 is probably right, or 12X8 if you want more pitch. Lean the low end, that is the key to the saito's. they come sloppy rich on the low side, and that has helped keep your engine well lubricated during break-in. Now, after a gallon of fuel, it's broken in good enough to start leaning out. This will make it purr like a kitten while idling down around 2000, or even a little less. This will also change the high speed tuning just a bit, which might give you the RPM range you are looking for.
Are you using at least 15% nitro? Saitos like nitro. They will run fine on low nitro, but the higher the bettermore consistent, low speed idle as well as more power on the top end, but you will have to open up the needles a bit, and you will burn more fuel.