Body roll is not necessarily a bad thing. Changing sway bars will change handling characteristics, specifically under and oversteer. If your car is pretty neutral right now, and you add a significantly larger front sway bar, you will most likely develop oversteer.
How Sway Bars Work and Why You Should Care | Speed Academy
If you just want to eliminate body roll, you might want to consider increasing springs rates. Especially if you're getting a lot of nose dive on hard braking.
How's your transient response? On a quick left right left, does it seem to wallow or get tail happy? If it does, that would be another reason to consider better springs.