Sounds like you have some nice kites - I'd pick one and spend some time on it for 6 months or so and see how you progress. Really get to know it, how it flys, and how it tricks.
This is very good advice. But what happens after you really know the kite. (After a year, you probably knew th TC.) When you start working with a second or third kite, remember to go back to the first kite once in a while so you do not have to relearn the touch of the first kite.
The problem is, the actions to perform the trick are the same for each kite. BUT the speed and strength needed to do the trick differ for each kite. Everyone has this problem. Some can made the adjustment very quickly, others, take a little longer.
Good luck with your kites, and have fun.