I have access to my league average through League Secretary but that doesn't really tell me much. It would be much more useful if it had shot by shot data.
Outside of league I use 'My Bowling Pro' app to track every shot. The details lead me to believe my variance is mostly due to making/missing spares and/or stringing together strikes. The app gives me a list of every leave and the conversion percent. So at the end of my practice sessions I am working on that 10-pin leave as it is the leave that needs the most work.
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