Can't say that I agree with you about changing the length on an asymmetrical ball.
Granted you retain more flare with longer pin to pap distances than with symmetrical balls but flare is only part of the equation. The core still has more distance to migrate to reach the PSA and that is more important to length than flare in my opinion. Not to mention that MB placement has an affect on length too. Take 2 asymmetrical balls and drill them both with a pin above 5" drilling with 1 being a 0° drilling and the other 115° and you will see a length difference. I think that more thought has to go into the layout with asymmetrical. balls to get the desired length and reaction shape. You also have to remember that the biggest factor to length is surface prep no matter what the core is shaped like.
I agree somewhat on spin time though.
To me spin time is more an indicator of how fast the ball will transition when it encounters friction.
In other words if you were to put the 5.0 core in the Havoc cover or vise versa the 5.0 would be more angular and the Havoc would be smoother with more continuation.
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