Before I switched to no-thumb bowling, didn't even believe carry down could be much of a problem. But then teaching myself to no-thumb with a non flaring Columbia scout showed me otherwise. Anyway, with my 380 rev rate and using primarily urethane, I have a lot of experience with factors that cause, or don't cause carry down.
If I'm by myself practicing on fresh oil, I see carry down in about 1 game. After 2 games, the lanes are no longer a house shot, and impossible.
If I use the same ball, in a tournament with 2 - 3 guys throwing reactive, and the pattern gets blown up by their equipment. Maybe I'm slowing down how much reactive is soaking up the oil. I have been learning than in tournament, I need to automatically move left when we switch pairs. But the point is, my ball is not reducing the backend enough to counter their reactive.
However, if you have 2 - 3 guys on a pair playing urethane, that would be an issue.
And I'll always say, what urethane matters. Some flare, some don't. Those that don't flare create carrydown very fast. Just a few frames.