Well not technical enough to know if 800mg of lamictal is appropriate. But here are simple questions to ask yourself.

How do you feel?
Are you better or worse?
What side affects are you having?

Personally I would not make yourself available to the opinions of people that are not doctors. If your pdoc is not broken or unresponsive, changing sounds like a big bother and expense that is not justified.

Meds alone will not make us happy in my opinion. They are a great tool to help stabilize us but then there is the need to introduce lifestyle changes that add new zest to our life. For me yoga, mindfulness, exercise, cooking and doing chores help me stay in a zone that is comfie.