An anti roll bar should help prevent grip roll too but if you feel it unsettles the car then remove it, a roll bar reduces the side to side weight transfer so in turn prevents flippage
If you are feeling brave have a read here, depending on how your brain works you may need to read it a few times for things to sink in. its also handy to have a car in front of you so you can see what is happening/being talked about.
http://users.telenet.be/elvo/