Yep, there are definitely curious things about the dynamics of these drugs. I haven't trialed Abilify yet due to not getting a prescription, but I have trialed several other psychiatric drugs.
I have yet to find a psychiatric or any other drug for that matter that would keep working at dosage X forever. What I notice is that I actually feel best during transition phases compared to steady state. What often happens is the following. At first I notice an improvement in symptoms, typically already after 12 hours or so. From the 12 hour mark, the uptick in functioning lasts anywhere from around a day to 3-4 days, nowadays rarely much over a day, but it's still pretty remarkable.
Then after noticing the drug has stopped working, obviously I decide to reduce the dosage at some point. What happens next is the exact mirror of when I started the drug, i.e., I start noticing improvement in functioning and sleep. This then goes on for as long as I can manage to reduce the dosage before I reach a new steady-state, at which point baseline symptoms return.
Obviously, this doesn't offer much insight into what is the best or any scheme of taking these drugs long-term that would actually work. I guess there's also a possibility that the dosage that
@leokitten took was simply too high (even though I reckon you were already on lower end of the spectrum for Abilify ME/CFS doses). Perhaps if you were very close to or slightly over the critical threshold, you managed to get back to the sweet spot after taking a break.