I always found Abilify to be pretty weight-neutral compared to Zyprexa, Serokill--a bunch of others. Might be worth considering. Strength and support.

Remember, if you stop it, there is a chance you could have to start chasing that psychosis stuff all over again and I am sure you know how unpleasant that can be. Don't forget that, is my advice, I guess. My last big psychotic time, it took almost nine months to make all the changes required to get me under control.