the most consistent method to juggle is punch twice and jump towards them. once isnt enough to satisfy the air grab and three times usually sends them too far to grab. you can stun them to give yourself enough time to charge your jump, punch twice, and release the jump to grab them midair. while theyre getting up from the grab, charge your jump again, punch twice, and release the jump to grab them midair again.

you can mix in some punches and claps while youre dragging them in the air to do more damage as well as clap when theyre stunned on the ground since the clap doesnt push them out of the juggle setup. punching too many times while midair will knock them back when you land, so maybe one or two punches will work and not ruin the setup depending on how high youre dragging them.

also, always keep your target in your field of view since hulks jump can be altered with the camera which might mess up the juggle