Sweet (bitter for bias) speed

I had a down session of 158 units as i was betting bias at the suspected sweet rotor speed of 3.9s to 4.1s of the rotor. The dealer appeared to spin the rotor at this speed while i lost. I should avoid this mistake later on. It is a john huxely wheel with normal seperator, ball used is 18mm ivory ball.

The reason i said suspected because sample size is not big enough, data can be mimicking

Sweet speed is an optimal rotor speed which the mometum of the ball and rotor is just cancelled out producing a mininal scatter. It is good for vb but bad for bias.