If Grounded doesn't work, you can put that Karma IO into Hover as well 
Save yourself a power slot for something more useful.
Like Presence/Challenge :P
Seven years of heroism. Seven years of friendships. Seven years of saving the world. Seven years of virtuous selflessness.
You will return, for you are the mighty City of Paragon, the City of Heroes.
You want a KB IO. When activating LR, you are high enough off the ground to lose your KB protection, so you often land on your butt. I should have made a huge character for that.
Now, if you aren't using grounded as a mule, I recommend placing a steadfast IO there instead. The negative energy resistance is negligable and your energy resistance will already be capped from slotting your other armors once you grab grounded. Then you can use combat jumping's slot for something else more useful, say a LOTG 7.5 for a Karma 6% to-hit. (yeah it says acc, but it's to-hit).
I want to make a hovering Elec/Elec. Do you have to be standing on the ground for Grounded to work properly or is being near it enough?
If not, considering adding Combat Jumping and a Karma IO for Immob/KB protection anyway.
"The Hamidon is a what what of what?" - Brian the mission guy.