From 1 ball whore to another......
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The answer is yes and no.
Like bhsbigcountry said, if you know what those 13 balls do, how they are different, and when to use them then it isn't a problem.
You can have a pass on the problem about what to take to tournaments. Conditions can be a challenge. Leagues are little different. Most leagues will put out a consistent enough shot from week to week, that it shouldn't be that hard to decide which balls to take.
The simple fact that you aren't sure which ball to start with is probably your biggest problem.
Somewhere in those 13 balls you should have a benchmark ball. One ball that will tell you how the lanes are playing, and from there you should be able to figure out how your other balls will play.
I don't practice much, and I don't drill a lot of balls anymore, but when I did, I had one ball I knew how it would react. I would always take that ball with me to practice when using a new ball. That ball would be the first thing I would throw, just to get a feel for the lanes. After that I would use the other balls to see how they were different (or similar) to my existing "benchmark" or "go to" ball. That way I would know if they were stronger, weaker, longer, shorter, more skid/snap, more rolly, etc.
Then, you always use that ball as your first ball. Based on what you see you should be able to know exactly which ball to move to based on what you are seeing.
I think a problem is when you have too many balls to choose from and start making ball changes instead of small adjustments.....I know that was a favorite tactic of mine! Sometimes it's easier to grab a different ball than to throw a little harder, take off some revs, etc, but it's not always the best for your scoring or to help learn to read the lanes.
I can't count the number of nights I've sat there and said "damn, I didn't bring the right ball!"