I just throw my strike ball for spares, I tried a plastic ball and stuff it just didn't work for me. For the ten, I just flatten my wrist and spread my pinkie wide and have my index finger tight in.
Do you use an IT? I resisted it for awhile and finally my guy convinced me to give it a shot about 3 years ago. Couldn't be happier. Highly recommend.
Yes, I do use an interchangeable thumb. Turbo is what I use currently. I have tried using the flatten wrist etc, but when on sport patterns that just doesn't work for me with strong assymetric balls that I typically use. I have just always used spare ball to counter act that.
Anytime I struggle with 10 pins I bring my index and pinky fingers in tight creating a platform to help almost palm the ball. Then I start my shot with the wrist slightly broken so that I'm almost pointing my thumb at the 11 oclock position (righty). That helps me promotes a release thats straighter up the back of the ball creating a long old school follow though.
Think I just need to find some time in my golf schedule to get some bowling practice. Since starting back to golf last summer, I haven't been to a center to practice one time.