1. Buy "Practical Shooting, Beyond Fundamentals" by Brian Enos and read it.
2. Your upper body is still rocking with recoil and you tend to stand up straighter the more you shoot which is aggravating the problem.
3. Cam your left wrist down until it locks. You have a bounce after your recoil, locking out your tendons will help eliminate that.
4. Twist your elbows out until they lock. This will tighten the top of your grip.
5. Try squaring your feet up to the target. This will keep your torso straight with your hips and balance out your abs. Additionally, it will give your more range of motion to the targets to the left.
6. Watch Dave M. at the next match. Most people are now teaching to keep arms straight but very few of them would argue with Dave's results.
7. Crunches and Planks. Tune up your core.

With the exception of 1 and 6, all of this to "tighten up and stabilize your bipod" to put it into rifle terms.