Well, levitating is kinda lik walking, so I guess you eventually get tired; of course he would need to sit for a while. Besides, do you know how hard it is to read and eat while levitating? There are some buoyancy issues and stuff
You're not fooling anyone! You just wanted to show off Titan's incredible strength. I don't blame you, though; if I had a superstrong mini-Godzilla I would show him off too! He has hard-earned muscles, of course he'll show them off!
Darth's head-on move is only Shadow Ball. He uses others mostly for utility, like Telekinesis, which serves no purpose of attacking per se, yet incredibly useful to move objects of various sizes and shapes around with little cost! ^u^