Okay, you may need to UNDO the changes you made to action, for sure, and probably the truss rod, but we’ll get to that in a moment. When you change string gauges on a floating bridge system like a Floyd Rose, it changes the tension you’re putting on one side of a balance system. You need to adjust the OTHER side.
What you first need to do is adjust the springs in the back so the Floyd sits parallel to the strings (or the body of the guitar, if it’s a flat top). See here:
http://www.ibanezrules.com/images/tech/angle/fr_type.jpg
To do this, turn the guitar over and take off the black plastic cover in the center of the guitar. You will need a #1 Phillips-head screwdriver to remove the (usually) six screws. Inside, you’ll see the bottom of the floyd connected to a “claw” by 3 or 4 springs. The claw then has two screws directly into the body of the guitar. Tightening those screws will bring the back of the floyd down towards the body of the guitar. loosening it, will raise it away from the body. You need to adjust these screws, retune the guitar, and then continue adjusting and tuning as needed until it is level.
THEN you can look at action and truss rod adjustments. Rule of thumb: if the buzz is above the 15th fret, you need to raise the action. If it’s below the 15th fret, you need to loosen the truss rod (no more than 1/4 turn every 24 hours, always with retuning).
Let me know how far you get and we can continue from there.