i advise you reading "strong magic" by darwin ortiz.
Ortiz's argument is simple. Try to make magic real for the audience. Doing a triple back flip diving board double doesn't add to the effect, it adds to the "Holy Crap, this guy is amazing with cards" effect. Here's an example:
I was doing a handling of Paul Harris's card throwing effect. I worked for hours on throwing and catching the card. Then I took it a step further, I split the deck in my hands and caught it. Then I added to the effect by making them believe their card is sandwiched between two in their hands. I preformed it for the first time, and the reaction horrified me. I had a spectator that would come back every two or three weeks to see my next effect, he wanted to see magic.
Everything went without a fluke and the person was amazed. He wasn't amazed with the transpo of their card, but moreof the throw and catch. His response was "Wow, You really good with cards!". His idea of me preforming magic was ruined.