Figured I'd revive this thread and see how everyone struggling with this is doing. My son was doing pretty well in the preseason bullpens until he had to catch a pitcher on the left pen (there are some plants next to that mound). He threw a few balls into the plants and also hit the ace standing off to the side. Prior to that he was letting it rip back to the pitcher. Now he's back to a very awkward throw to the pitcher, but it gets there. I overheard a couple dads during pitcher warmups in the first inning about how they were going to run all over this catcher. When he threw down to second they both said "oh" at the same time. My wife laughed.
He's struggled the past couple games on outside throws to first on dropped 3rds, but I think it is more related to a recent back injury than yips.