You say your arm isnt strong enough to throw hard with higher weights, but what you will learn is that you dont throw the ball at all, you pick it up, let it swing down free, dont muscle at all, the height you drop it forward at will give it its own speed, I think I could probably toss a 25lb ball if it fit properly and i didnt muscle it using that technique.
The power groove is a decent entry level ball, you might be able to use a heavier ball, one rule of thumb is weight/10, so for a 140lb person 14lb ball, and yes a properly fitted ball feels MUCH lighter. I used to use a 14lb ball and with a proper fit 16lbs feels lighter than the 14lbs i used to use at the house balls.
a jump from 8 to 13 would be a lot. I notice a lot less deflection even moving up to a 11 or 12 from 10 when my wife bowls, but a lot of it is also speed you are obtaining.
Edited by Shale (05/21/09 12:06 AM)
Bowling Age: 18 wks
Hot Sauce Pearl(254)