When I start leaving flat 10s or the ball is puking and not going thru the rack the way I want it, time to create more angle.
Which is not the same as needing a ball with more angularity.
You could just move deeper to catch more head oil or get the ball further out into the dry. Usually if those don't work, then I'd try a ball with more length and a sharper backend, usually a pearl.
It kinda is. Take my X. I start leaving flat dimes, I can't just move my eyes right. It's not a ball that likes to go left to right. So I'd ball up to a Drift or HB. Then I usually ring a dime, and fry.
Yeah, there are times you should move zones, but with the puddle in the middle on some house shots, you may need to really ball up to a DCT!! LOL