I've noticed that the bowlers with the best "carry" are the ones that have good forward roll when they get to the pin deck. Those that have more spin tend to leave more solid tens and other pins on good hits. I define good forward roll as the ball seeming to go rolling faster than the forward velocity of the ball. Think of a hot rod with the wheels spinning faster than the forward motion of the car. Also it seems that the faster the ball gets into this forward roll, the better.
Most of the problem with carry is people's too broad of a definition of the pocket.
It seems the pocket has been defined by "where I can get away with the most strikes"
If you shoot at the 1-2-4-7, and try to hit the pocket side rather than brooklyn, the goal is to get the ball to that "perfect" sport which hits the 1 into the 2, into the 4, into the 7.
The more you miss that spot, the more likely you are to break the chain reaction.
If you think of that spot as the pocket, and anything that would break the chain reaction as missing the pocket, most of your non strikes can be directly related to missing the pocket.
Once you reach that spot, the next factor is deflection.
Deflection is a function of momentum.
If we were able to quantify the quality of the release, and how complete the ball reached the roll phase, we may be able to compare "apples" and "oranges".
A moderate release 70%, and completed roll phase 100% could equal 70% momentum into the pins.
A stronger release 90%, but only obtaining a 80% roll phase could equal 72% momentum.
Most of the shots that you see rolling forward and hitting the pocket properly, the ball exited the oil pattern right up against the wall of oil.
Which if hits the pocket once, tends to hit the same spot over and over again, until the end of the oil pattern gets damaged from usage.
This is where the notion of "wrong ball" comes from.
With a wall, you can exit the pattern up against the oil all night long with plenty of room for error leading up to the exit point, but the real question is can you get the ball to go from there, to the pocket.
IF you brought enough different balls with you, and know how to read the reaction, you should be able to figure out which ball to switch to.
However, if you didn't bring the right ball for those conditions, it's going to be a long night.
Off by a little bit, and your carry suffers.
Off by a lot, and you're all over the head pin.