Personally, I believe that Pit is OP. He just seems too indestructible. Perhaps give him 1500 ATK? I like the Gooey Bomb's mechanic, but it seems a little off-worded.
He can easily be destroyed by things like Dark Hole, and most Xyz Monsters have an ATK that outclass him. I'll be keeping him the same.
I know Gooey Bomb is worded weird, but I don't know how it should be worded so unless you can give me a better way to word it, it is staying the same.