Try using the Sticky Paws tape. I think it works better than foil because it is clear and automatically sticks. I would invest in a laser pointer. They are WONDERFUL for tiring little kittens out!!! My Kahlua will chase a laser pointer until she is panting!
As far as spraying with water, it sounds like you're experiencing a very common issue. When cats see you spray them with water, they associate you with the water, so they won't do whatever they're not supposed to be doing when you're home, but when you're gone, it's fair game. The key is to spray them without them knowing your doing the spraying. Keep the bottle with you. When you see one doing something he's not supposed to be doing, give a little squirt without looking at him (time to practice your peripheral vision!). That way they have no idea where the water is coming from, so they associate the action with water.
Declawing
can be very inhumane, but there are new methods available. We have two indoor cats and they both have all of their claws, but we decided that if declawing was ever necessary, we would use the tendon snip method. Instead of amputating the first knuckle, vets snip the tendons that unsheath the claws. You would still have to trim the claws, but they cannot unsheath them themselves. It's still not terribly humane, but it's better than amputation!
Getting through the kitten phase is the hardest part if you've got a difficult kitten. It sounds to me like you are trying your best, and that is all that can be asked of you. You know where your limits are, you can judge when enough is enough. My cats hate being locked in/out of rooms; we get the same crying and scratching. Spend as much time with them as you can!
Hang in there! I had two litters of kittens totaling 9, and I went gray during part of that! Just keep trying and asking questions. A good book is called
Kittens for Dummies - no offense meant! My husband and I have TONS of "Dummy" books!!