3x a week is unsustainable for reasons of tolerance, as a non-naive person you should know that. You can only up the dose so for so long, and when you're still doing this to no more apparent benefit, what then? It's wonderful that this is helping you, but would it not be better to build a healthy and sustainable relationship with the drug now, while you still can? I think you underestimate the negative impact a dissociative addiction can have on a person, especially psychologically.
Edit: you addressed the above in your post while I was writing it..do you think you'll notice when the benefits start outweighing the risk every time? It seems you have never been psychologically addicted to anything, most people don't notice when it becomes bad. You know, denial and stuff, it has happened to many of us. We just don't want to see you end up in a worse place than before when you could have avoided it through some extra caution.