Moved from the TCG Help to the TCG Competitive as the OP is looking for discussion on a competitive topic rather than advice. ~bbninjas
From someone who has ran Juniper and N for years, you might sound a little crazy.
Frankly, Caitlin isn't the best draw card in competitive play. Although it's a neat style of draw, it is drastically useless when you have small hands. Professor Juniper, N and Birch allow you to jump from a small hand of two or three cards to a big hand of six or seven! Caitlin is generally only good when you consistently have
large hands, which in virtually all decks, this rarely happens.
You appear to be worried about shuffling cards in your hand back into your deck, because you wanted to keep those cards in your hand. The thing is, in competitive play, you
need to do this. Cards like N, Birch and Juniper refresh your hand to give you new opportunities. Also, in competitive decks, you will be running multiple copies of cards, so when you do use this Ns, Birchs and Junipers, you are more likely going to get the card you need, and don't need to worry about losing important cards before you used the Supporter.