I wouldn't worry about lack of visions or memory.
Over the past 6 months ish, I have not been getting visions and if I loose the tail of the tread as to what was going through my mind then it is gone for good.
I now prefer it that way.
I think there is work being done and the visions are a distraction.
Saying that, 2 days ago I did a large amount (changa) , the visions were so strong, with that alien feeling, that I started to panic which in turn spoiled the experience, even though I calmed myself I know that I messed up.
That is some thing that re affirms how special this stuff is, you can fight it or accept it, it does not have free reign over you.
It (they) requires permission .