I'd say you'd do better with the line lock in there.... Might also want to consider a brake pressure gauge so you can get your brake pressure the same for staging every time!!!! Consistency is the biggest thing in getting the car to launch right and going rounds. Establish a routine that works for you and your car then stick to it. Do the same thing in the same order each and every time, as it becomes a matter of habit the nerves settle down and you'll start seeing much more consistency from pass to pass.... The nerves get the old adrenalin pump going, the knees start shaking, and it gets really tough to make the car work the same every round.

One thing I do, when I'm at the front of staging and the pair ahead is just in the water box I close my eyes, do some deep breathing and visualize everything I'm going to do to when I stage the car....Got to learn to get your head and your body to relax during the staging process......