In Star Fluxx, have you needed to change how The Computer and The Unseen Force play?
I tend to think of Unseen Force as annoyance, whereas The Computer is probably the strongest card in the game.  There are various things you can do to try to dilute the power of an opponent's The Computer, raising the draw and play count rules and creating hand and keeper limits.  Plus you can always steal keepers or play Brain Transference.  That said, if someone pulls out The Computer at the start of the game then it is really hard to keep up with them.  There are other strong cards in the game like Holographic Projection and The Captain so it doesn't feel like the game is broken to me.

Is it possible that you are a much better player than your opponents are and it is this that grinds them down?