First of all, Congratulation!
As for the emotional connection, or emoting, so to speak, I understand it could sometimes be disturbing. Actually I am wondering how much time to you have before the actual showcase? Normally, when I practice (though this is mostly for competition - but the same spirit), I have two mode. One is the drilling/technique mode, and the other is performing/competing mode.
Normally, when practicing, I focus on the technique (timing, foot placement, etc) - so that when competing/performing, I don't need to worry about it. At this point, I normally don't care about emotional connection - unless I am specifically practicing on it.
And when we do practice rounds/ and actual performing/competing - I just throw the technique out of the window and dance. As some of my friends say "what sticks, will stick; what does not, will not." In theory, your muscle should already memorize the techniques. And seriously, normally, the audiences do not know your routine, or the technique - if you mess up, do it as you mean it. Energy is the key, IMHO.