This means that if we knew when the ball timing (speed) was about 1350ms per revolution (about 1.3s per revolution), then we'd know the ball has about 12,500ms (12.5s) before it likely hits the dominant diamond and falls. Again of course this wont happen every time. It only needs to happen enough of the time.
First thing I see is the fast rotor speed. I wouldn't bother with that wheel unless the ball had almost no bounce.
Does it matter what round the ball is in? Should we just focus on the lap he's slowing down?
Question not clear, and besides what you need exactly depends on the approach being used.
As far as the rotor speed goes, the dealer isnt supposed to spin the wheel faster than what the surveillance cameras can read. A typical wheel speed should be around 2 and a half to 3 seconds. If the wheel is too fast, the player can absolutely ask the pit boss for the wheel to be slowed so you can read the numbers. That is not out of the question. This really comes down to an issue of dealer selection. Many factors to take into account besides just prediction...one of which is dealer selection.
Addressing the issue of the ball striking the diamonds, this doesnt make much of difference as people may think because if the ball were to fall directly into the wheel without resistance, the scatter would be greater, whereas if it strikes a diamond and momentum is slowed, it will be likely to scatter less. In these instances a bounce is more likely to occur. The number of pockets which will pass by on average for both drops should be manageable. This is as will also depend of the depth of the frets and the speed of the wheel as well. These things have be considered when selecting a wheel and also a paticular dealer.