I have a few excercises to add: Depth jumps, clap push ups, clean and jerk, snatch, and 'power' sit ups.
Depth jumps are excellent for improving vertical jumping ability, an obvious plus for a vaulter. Stand on a box 2' off the ground, step off, land on both feet, dip down, explode back up.
Clap push ups are good for strengthening the 'weak link in the chain' in an action-relevant way. These should be supplemented with bench press. (Maybe KB could talk about his 'cheater bench press' excercise again.)
Clean and jerk (I didn't see you even mention cleans in there at all) is probably the best thing you could do in the weight room. (It is 2 lifts in one, so it really isn't a fair competition, is it now?

Snatch would be next.
'Power' sit ups are helpful with quickening the SSC in your abdomen. Do your sit ups on a swiss ball while holding a 10-15 pound medicine ball at your head. Do them as quickly/explosively as possible.
You need to all-around lower the repetitions. Raise the weight. It is less time consuming, and it is more sport specific.
And do gym stuff the day before vaulting, like KB said.