Why does my ball do.....

[GeoLes]

I think, the contrary. Now is a good time to reinforce good habits and to learn adjustments. Make the swing free and effortless. Work on performing the exact same release to get the same result each roll. Check wrist position. If the ball is doing what you want, move left or right to get the ball in 1-3 pocket. (or 1-2 pocket if you are lefty).

I had the same experience with my Brunswich C-system. It was not until I was aware of the inconsistencies in my delivery that I was able to use the ball reliably.

Practice may not make perfect, but it does make "more better".

[Tampabaybob]

Keep asking myself if I made a mistake going with the Pyramid Path. Will learning with that ball contribute to bad habits in the future?

DLP......You didn't make a mistake by purchasing the ball. What you've come to realize, after having thrown it for a while, is the fact that the ball slides further that you'd prefer. So now as your next step, upgrade to a bit more aggressive ball, keep your Path as a spare ball (meaning this is the ball to shoot your spares) and learn how to correctly release the newer ball to give you more roll. It's a progression, that as you get better, you'll probably want to go even higher, with an even more aggressive ball. But that might be as much as a year or so away. It appears you like the game very much and have the desire to improve your average. Speak to your local pro shop and get a second opinion. Explain what's happening with this ball, what you've heard here on bowling boards, and see what he/she would recommend. Also ask if there are any certified coaches available in the local area that you could call for a lesson. That would help a great deal. Then see what the coach suggests as well.
Good luck, keep us informed and well be happy to help in any way we can. You can also check Bowl.com for coaches in your local area.