Should I switch from Abilify to a new antipsychotic with less weight gain?

I have schizoeffective disorder, and Abilify is the only medication which stops the worst of the symptoms, but it causes weight gain. I'd like to lose weight to fight, even at my age. I've been trying to cut weight for a month now, because I wanted to Amateur fight, but I only lost 5 pounds so far, so I'm still not light enough to weigh in at 205. I want to lose the weight, and i'm positive it's my Psych meds which cause me to gain so much weight. I was at 190lbs about 7 or 8 years ago, and the damn medication has pushed my weight up to 222 as of last month and 217 right now after losing another 5 pounds.

I want to lose the weight, but I have to stay on freaking psych meds because my mental health is way more important even than weight loss goals. I'm afraid to go off Abilify long enough to try a new medicine, because what if the new medicine doesn't work? I'll go batshit crazy again, which I'm still not entirely cured as things stand.

What would you do? Try the new medicine anyway? Or just stay on Abilify?

Updates
2 mo
Oh yeah, I see my Psychiatrist again in a few days, but I'm still not sure what to do with myself. I'm type 2 diabetic, which is somehow geneticlaly inked with schizoeffective disorder anyway but I can't afford to keep packing 25 extra pounds on me anyway. Either way, I think I'm going to try the new medication and somehow phase out abilify.
Should I switch from Abilify to a new antipsychotic with less weight gain?
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