I have given myself a goal of fixing my godawful position over fences before spring so I can move up safely. This is the end of her second year out and she's still jumping like this. Sadly her rider sucks or she'd be doing Novice by now with her love for jumping. The dressage she still hates though.
She's a cutie! Looks very willing for sure. Looks like her saddle is slipping back a good bit over the first couple of jumps in that album. Can't tell if your girth is loose in the pictures obviously but might make sure it's good and tight! My old jumper's saddle did slip back when he jumped hard, drove me nuts. It helped when we got a new girth, nice strong, fresh elastic.
Shorten your stirrups a couple of holes, do some hours of trot work in your 2-point and before too long you'll be jumping together. I wouldn't move her up till you have more strength and confidence. When she knows you won't catch her in the mouth, she'll jump with more confidence and less leap You 2 look like a perfect match. It just takes work!
Don't forget, standing martingales are not allowed in Eventing. I'd put on a hunter-style breastplate-this is the one I've had for the past 25 years: http://www.bitofbritain.com/Nunn_Fin...tic_p/9563.htm
Have fun with her. You're right to be taking your time before moving up. Do it when you're both ready and it will be a whole lot more fun! Good luck!
I know you didn't ask for advice, but I'm gonna give it anyways. I have the same problem, as did some of the students I used to teach. Tie your stirrups loosely to your girth with baling twine (loose enough that your leg can hang in a normal position, but not so loose the stirrup can move back by more than 3-4"), and then jump like that. Everyone I've tried this with (including myself) has had a Eureka! moment with this technique. After you jumps a few jumps like that, take the twine off and try to hold your leg in position. Repeat as necessary.....Good Luck!!!
I have found the most effective exercise for steadying one's leg and improving core strength and balance to be trotting without stirrups. Rising trot really strengthens leg and sitting develops core and balance. I would do just 5-10 minutes per ride and my instructor would comment on the VAST improvement every week when I shipped in for lessons.
Best of luck to you both!
"We can judge the heart of a man by his treatment of animals" Immanuel Kant