basically, you cant have too much momentum. ( I dunno if thats true for those big-shot guys like NutHug and Warcry, but you're not there yet.) Another tip is too extend everything, then contract it all, or atleast so you'll get a hit on uke. should be hard. and another one: hitting and kicking at the opposite sides is a pretty good idea, but its easier, and looks better if only one of them hits and the other one is going at the opposite direction of the kick, but is doing something different.