You can average 150 bowling that way. Consistently hitting your mark is crucial though. As I'm sure you've noticed the ball will literally stop spinning and end up rolling forward. This take away a lot of the balls energy, reduces the hitting power, hook and pin carry so averaging higher than that will be difficult. Those are the main reasons people bowl the other way, too increase the margin of error and get higher scores. I use to throw that way and averaged 168.
Once I learned the "correct" way my average dropped for awhile until I got use to all the differences it made to the ball's reaction then shot up well past that. It's a known technique just not preferred.
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