I'd suggest reducing the amount of balls. If you can only run 5-6 balls then play the 5 or 6 ball ghost.
Try this little game out: Throw 5 balls on the table and make sure there are no clusters and everything goes in a pocket. Take ball in hand and try to run out. If you get out you win. If you don't get out you lose. Play this way for a race to 5. If you win then play the same game with 6 balls. If you lose then play the same game with 4 balls. You can also break the balls if you want but it can lead to clusters which don't consistently measure your run out abilities.
Another thing to think when playing the 10 ball ghost is that the first 5 balls are the hardest to run out b/c the table is so full. So you're actually getting through the hardest part of the rack. You just have to stay in line and stay focused.
Good luck!
Keith Jawahir:
This is what I do, and it's helped loads with my consistency. The only addition I would make, is to actually rack the balls and break, so you're working on your breaking skills while you're at it. After the break, remove enough balls so you have 5 remaining (6-10, 5-9, etc.) and take ball in hand. As you beat the ghost or lose to the ghost in races, add or remove balls. This also helps with your endgame and SHOULD help nerves shaping and making the out ball.