But theoretically, the cannabis should have helped that. I also felt a lot of nerve twitches all over. It might have been too high THC, but it was not an experience that I cared to repeat.
For the kind of experience you are talking about, I would think psychadelics would probably be the better fit.
If you have control problems with cannabis, I suggest you stay well away from psychedelics. Everything that you mentioned regarding your cannabis experience is something that you learn to integrate and eventually move past, to super-creative super-introspective states that you can harness for growth and value. You can learn to guide the experience while you're undergoing it.
Psychedelics are in a different class in that there is no guiding the experience while it's happening. The best one can do is prepare the context (set & setting) and hope for the best. In that sense, they're a lot more difficult to handle than cannabis, but also potentially orders of magnitude more rewarding. But to reap those rewards, I feel that one needs to deploy -if only temporarily- a different model of looking at the world: more like a shaman treating the substances like sacraments, with awe and respect, than a cold rationalist.
For the kind of experience you are talking about, I would think psychadelics would probably be the better fit.