I find that performances shouldn't be too planned. Then it feels as though you have to follow a set script instead of actually performing and interacting with your audience, as though they are people, not subjects 
I find that performances shouldn't be too planned.
Question: Have you ever read any books on acting? Or taken acting classes?
Question: Have you ever read any books on acting? Or taken acting classes?
Yes, I haveFor about 3 years.
However, I find that each spectator is different, and each needs a different type of performance. I may have studied acting, but I've also studied improv, and I find the latter to be much more useful when it comes to magic.
Okay, so then you would agree that the point of scripting and rehearsal is to make it look spontaneous and natural?
And while I do agree that ad-lib is an essential skill, I see magicians who don't rehearse and have no structure whatsoever, and they're all terrible.
I would argue that if you're going for comedy, rehearsal is essential. Comedic timing is paramount. The advantage to rehearsal is that it allows you to think on the fly without spending a lot of brain power just trying to remember what comes next.
Here's my input on this. I think the reason why people aren't getting the reactions they want is because their trick doesn't have any meaning. Most of the tricks are just "Hey, look what i can do!"
There was a phrase used by Darwin Ortiz that summarizes what i'm saying. I goes "So you can do magic. Why should I care?"
Does the spectator really care that you can pull out 4 aces in a flourishy way? Do they care that you can make balls travel from one cup to another? Do they care that you can make a bunny appear out of your hat? Of course not! It doesn't pertain to them. The magician's ability to to those tricks wont help them in any way.
The trick people care most about are ones where they're emotionally hooked. For example, bill switches like Prophet or Extreme Burn are really strong simply because people like money. They can relate to it. When the see that you can multiply money with a snap of your fingers, they'll react because they've been emotionally hooked.
Same thing applies with selected cards. Why do card revelations have such a big impact on audiences? Because they picked a card. It's THEIR card. It personal now. This is enhanced if you can have them sign the card. People care about themselves more than anything else so they're emotionally hooked.
So all in all, it's important to have good character and audience management. But if you're trick fails to appeal to the audience, than everything else won't matter. Just remember this important question: "So you can do magic. Why should I care?"