Hey, I've been training Planche for a month now. Below, there is a video of my tuck planche hold [trying to do advanced tuck]. I'm aware of losing my protraction. I know that during planche hold we should point our biceps/elbow pits forward [shoulder external rotation], but my left arm is much worse in doing that the more I lean forward. So the more I lean my left arm wants to go back to internal rotation and thats creates some kind of weird unbalance. Can you recommend any exercises to fix it?