That sounds like a HUGE dose to me!
I take 100-300 mg a day, but in that range it keeps me calm and makes reality more consistent.

I'm on a variable dose so I can manage symptoms more effectively. I can tell I'm getting over-medicated when I start slowing down, getting sluggish, foggy and confused all the time. I can tell I'm getting undermedicated when I speed up, reality starts to get loopy, I can't think straight or life doesn't make sense.

Within that range, I feel closer to sane than I ever believed possible.