I don't think tape effects springs at all, juniors or adult.
Those springs take loads of pressure. The springs take like all of your weight and a lot lot more from jumping. You can bend tape with your fingers. You would need enough tape to make it hardly move when you jumped on it to make any noticeable difference I think. So I would tape up as much as necessary. If you tape is like an inch think around the spring I think you might cause some resistance then, if it was gaffa or something. Tape can only do good
But I agree about the taping thing choco. It may even be more important on adults, higher to fall.
and lol Darf! As if, I may tape up my knackered springs with 50 layers of gaffa and see if it makes a difference. Spose backs up my theory tho. Less spring resistance means you need less tape you help reinforce it.