ORIGINAL: MinnFlyer
Well, I don't know what the problem is. I flew this plane several times including the maiden flight and I never had a nose-over issue - and yes, I fly from grass (Not even good grass)
You installed the Saito 82 too so you had the weight. Guys if it's close to wanting to nose over I'm gonna start out with just a half tank of fuel. That alone will save 4 to 6 ounces (I don't know the tank volume, likely 11 ounces).
I'm also gonna run the smallest diameter prop that is practical.