You're right, SVstar. Since no-thumb bowling is still newer to me, I have some release inconsistency from time to time. Thankfully, it's getting a little better and more consistent all the time.
I probably misrepresented things when I said over-under. I'm just not liking the look/shape I get with my resin pieces. On our house shot, I'd pretty much have to start the night playing 4th arrow or deeper, and it's still no good because I'll leave solid 9s and 4-9s if the ball creeps the least bit high. Then, I'm also susceptible to a lot of 7 pins from the ball coming in too steep. Now, I've tried combatting that with surface to get the ball to read sooner and tame the backend down, but I'm still not getting the shape that I want.
All in all, I'm not all that worried about it for the house shot because urethane and plastic look very good there. My concern is when I go to tournaments, the Open Championships in particular. I know that it's possible to use urethane in some of those situations, but if I'm trying to help 9 other guys break a pattern down, I'm not sure urethane is what we'd be going for. As such, I need to find a way to create some predictable shapes with some non-urethane pieces. That's what I'm looking for here.