Hey wbronco,
There have been some very good suggestions offered here so far. I will elaborate on the typical or "general" type of sport conditioning a little more.
Comparatively to a house shot where our center oil or puddle in the middle tends to be much heavier (which is what offers us good natural skid or immediate tug room), the sport conditions tend to be actually a little lighter in oil concentration in the middle than the outside boards. Knowing that a "typical house shot" (THS) has heavy oil in the middle and drier boards to the right, we have a ton of forgiveness on this condition. If we miss right, the ball hits the free hook and returns to the pocket and if we tug it or pull it, it holds in the center oil towards the pocket.
On an average (and I'm generalizing), sport conditions are the exact opposite of the THS. The oil concentration is heavier on the outside and lighter on the inside. Now, if we miss right, it hangs and does not recover and if we miss left in the lighter oil, it hooks past the pocket. There isn't much room for error.
With this being said, by playing your comfort zone of 6-10 board, you may be actually playing the hang (or heavier stuff) and that is very difficult. Your better angle to attack the shot would be to play inside on the lighter oil so the ball can create more friction and offer you some kind of reaction.
I'd try moving in to about 16-17 board with a slight swing to about 11-12 board at it's furthest out point and see what reaction you get. Hopefully the inside is a little lighter and it "may" offer you a better reaction. Try this and get back to us with your findings because from there, we will have a better understanding of how much oil you're actually dealing with which will then allow us to pick the right ball for you to use on that particular shot. Hope this helps some...
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Rick Leong - Ten Pins Pro Shop
Track Intl. - Amateur/Pro Shop Staff
Vise Inserts Staff
Trackbowling.com