He should not be falling. You are making necessary changes so that will help correct any issues. Falling, not jumping to escape, is a sign of possibility early MBD, gout or over supplementation. I would keep a close eye on him. I don’t know Jackson’s but I know they need lower doses.
Usually he will fall when attempting to climb leaves instead of the branches. I’m not sure why he’s so obsessed with climbing on the leaves themselves instead of the branches that are EVERYWHERE lol.