Coming up with new item ideas is definitely good. I would suggest trying to think of something that makes your item special compared to other items of its type. For example, there are three mythical energy torsos: Naga, Sith, and Grim Reaper. Naga is more or less the balanced one, Grim Reaper trades hitpoints for a huge energy cap, and Sith is trash. Same for weapons, drones, etc. - to be worth adding it needs to be special in some way.
P.S. - maxed mythical stats are usually better too.