I use to have trouble with the 10 pin but then i got some help from a friend. I radically changed my position on the approach across about 10-15 boards and started just aiming for the centre boards on the lane rather than an arrow. As i bowl on the dots, its not a big issue for me. I use an Ebonite Tornado for the 10 pin which has minimal hook for cross lane shots.
The big key is...Follow through! If i don't follow through, i struggle to get the spare. If i follow through, i hit it almost every time. Make sure to get the ball out on the lane and it shouldn't be too much of a problem.