@West GA Precision 22LR . Just texted Chris (Red Hill Range). He has 300 yds. I'd be happy to help if you wanted to host something on this side of the state as well.
One would think that someone who hasn't even shot this kind of match may be interested in hearing input from those that have shot a lot of them, ran and RO'd these types of matches. But at least there is some sort of inertia coming from somewhere.
That's how you shoot standing. Nobody is holding center up. You have to time that wobble and try to keep said wobble consistent. Don't feel inadequate having to shoot with a wobble.
Couple pointer I can see from your stance. Get rid of that chicken wing with your right arm. Pull your left arm...