Indeed, that is my experience too. I feel that there are different levels of "toxic shit". You have the surface level that triggers very easily and that can quickly be discarded. Then again, many other herbs triggers this level too. The more caapi/maoi you take the deeper it digs. Some shit takes a long time to surface. There may be other stuff that has to be dug out to get to it. You can use very strong doses of maoi if you want to dig new stuff out. Adding DMT also helps. It puts more force and energy behind the caapi.

Also intention seems to have something to do with it. You can work for years without getting any significant purging, then you change your intention on what you want to work with, and then suddenly it comes. An intention of healing your body and mind may make you purge more than an intention of exploring hyperspace.

Have you ever noticed how clean you feel after some journeys? You can go into the forest or outside and see the beauty that is in nature. It is like the world or your perceptions has been washed clean. In my mind this is because it has cleaned out the surface level of your mind. It is like the surface of a water in motion. It is hard to see through. But if it is still, you can see much clearer what is beneath. The problem is that the surface area is not agitated by itself. There can be rocks that disturbs the peace. I think that with psychedelics, and perhaps especially with the maoi/dmt combo you can dig deeper and remove the culprits. You can dig under the surface and remove that stone that agitates the water. This way you will have permanently have removed something from yourself that creates disturbances.

So, i'd say continue digging, and who knows what you will find down there