Man, at this point I'm not going to tell you what or what not to do. However this is a Harm Reduction site, so I can offer advice and leave it up to you whether you want to listen or tell me to fuck off.
Have you talked to a professional about your plan to only take meds when you have psychosis? The reason I ask is because my experience, this yo-yo type of effect can be more detrimental for overall brain health than maintaining equilibrium by staying on a med that works consistently, every day. The goal is not to just fight psychosis when it happens but long term, to stop psychosis from happening in the first place. And for some people, the only way to do this is to remain on some type of medication maintenance all the time.
Maybe someone with more technical knowledge of the brain and serotonin can chime in, but I have had a psychiatrist outright tell me that going on and off meds all the time is what was hurting me more than anything. Believe me, I tried for years to do what you do and only got closer and closer to a pine box each time.
I know this is the Invega thread and I'm sure we can all agree that this drug is awful. I'm just saying maybe there is something else out there that, if you stick with it and work through the side effects that are often not permanent, then you can finally find peace in your life. Maybe its Rexulti or maybe something different, I don't know. Sometimes it takes work and diligence and sometimes its not easy. I just hate to see someone suffering when there could be better options out there