I've never tried Wellbutrin so I don't have any advice on that front, but I have heard that it can "stir" people which might add to cycling. Though it sounds like you aren't swinging too hard. Just to slightly above normal? Maybe your perception is shifted because you've been depressed for so long and you are actually on your way up and out?( just a guess! I'm nowhere near qualified to make these calculations)
Also my understanding is that lamictal IS the mildest mood stabilizer

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