Jonah,
After nearly 40 years of bowling, it comes down to doing what you do best. Very few bowlers are as talented as Barnes and can change his primary game to something else (despite it taking several years). Perhaps you are too. But I find that bowlers in general simply do not evaluate there skills to know when some change is positive or negative for them. Juding by scores is just a poor indicator. Just because Barnes can do this, you might not be able to make that change with the consistancy you are currently employing.
Straighter is greater, but it still requires, hitting your break point, controlling your speed and revs and understanding what is changing on the lane (experience and applying knowledge). If you are the best in the world at these things then you are the best in the world period. You are no longer throwing the ball the way you want, you are throwing the ball the way the lane is telling you to.