When stable I cut out my AP's and stay on Lithium and clonazepam. This works well. You do need to have insight and will power to go back on them when needed. That can be tricky if mania hits hard and fast. It helps if you have people around you and regular pdoc visits to help you catch the mani/mixed before it gets out of hand.

How much Seroquel do you take? You might have to come off it slowly. Talk to your doc, they may be able help you with your goals.