Any suggestions on achieving that balance between stalker and hard-to-get?
LOL...
I think you hit it on the head - there has to be balance. You know that too much of a good thing...and so on.
But, don't forget that that balance also factors in how much he is into you, how much history you’ve had, etc.
Think of it as scales. On one side put how much he is into you, on the other, clinginess, etc. If he likes you a lot...and you're clingy, you still might not tip the scales and have him pull away. The more he likes you, the more power you have. The more power you have, the more you can get away with (the more "baggage" you can put on those "scales").