In a steep turn you should be coordinated. If you are coordinated fuel should not transfer tanks. Think about it. Do you feel like you are hanging sideways during a steep turn? Is your face on the side glass? Fuel would transfer in a slip. A point in which you would be uncoordinated during a steep turn is when you are changing bank angles (like the entry or in the case of commercial steep turns, the transition to the other direction). Proper technique includes simultaneous rudder and aileron input during the maneuver, maintaining coordinated flight most of the time.
Now if you do get a fuel imbalance it cannot be that much. Assume 30 gallon tanks both half full. One gallon of Avgas weighs 6 pounds. 180 pounds per side. To get any significant roll moment due to the imbalance would take quite a bit of fuel to be transferred. I doubt your fuel system being able to transfer fuel fast enough to make it significant. I have flown during training with an accidental fuel imbalance of 20 gallons in an Arrow and there was a slight rolling tendency. It was nothing exciting.
The most probable explanation of how you entered the spin is the lack of right rudder. Plane starts turning left due to p-factor and you correct with right aileron without thinking about it. You are pretty much in a slip and are uncoordinated. Stall and the fun starts.
Now if you do get a fuel imbalance it cannot be that much. Assume 30 gallon tanks both half full. One gallon of Avgas weighs 6 pounds. 180 pounds per side. To get any significant roll moment due to the imbalance would take quite a bit of fuel to be transferred. I doubt your fuel system being able to transfer fuel fast enough to make it significant. I have flown during training with an accidental fuel imbalance of 20 gallons in an Arrow and there was a slight rolling tendency. It was nothing exciting.
The most probable explanation of how you entered the spin is the lack of right rudder. Plane starts turning left due to p-factor and you correct with right aileron without thinking about it. You are pretty much in a slip and are uncoordinated. Stall and the fun starts.