Well I use to take 900mg (which is a low fourth plateau dose). The main effects last for 6 hours (but I'm still feeling really stone for 2 more hours at least)
Less than 900mg (3rd plateau doses) doesn't make my mind travel: my body is affected so I have trouble walking but I'm not enjoying the trip as I don't feel much mental effect (other than some confusion and some ophoria). No big dissociation.
More than 900mg (strong 4th plateau dose) will make me so damn confused/dissociated that I cannot do anything and I'm not enjoying the trip neither (I just find myself trying to walk around, aimless and completely wasted, if I'm not already dozed on the ground )...such doses are ok for deep experiences lying on a bed with a trip sitter watching over you, but don't expect to make any activity on your own.
But 900mg is just perfect for me: great ophoria, makes my mind flow around (beautiful visual dreams in my head), I find myself plain dissociated but I'm still able to do interesting things so I'm really enjoying my trip
I'll add that with 900mg, even if my ability to walk is really impaired, it seems I'm much more able to control my body/movements than with 700g.
I can explain it this way:
the more you take dxm the more your body is impared BUT the main thing is that if you're too deeply dissociated, the mind is just so far away from the body that you cannot use it (very very very difficult to move around, sometime with huge doses you just can't walk),
and if you're not dissociated enough your impaired mind is still present and starts trying to deal with your impaired body so you can walk around but your mind is poorly interacting with the body making the things more messy and confused than if the mind was just letting the body act on his own.
SO, a perfect dose would fully dissociate your mind (so your mind is flying around not taking care of what's happening down there) , but not too much dissociated so your mind has still some contact with your body so you can still use it and walk around.
For me 900mg does it: I'm just plain dissociated and my mind which is travelling around doesn't take care of anything concrete, so my movements are much more automatic and much more fluid than if my mind was trying to control/rule what's happening...
For instance with 900mg I'm not thinking "I'm turning to the right now", I just do it spontaneously without even realizing I'm now going to the right: my intention/will was to turn to the right but as I'm doing the move, my mind is already flying in some other weird dimension so my body just makes the move automatically. Therefore I can walk around more fluidly on 900mg dxm than on 700mg (as 700 doesn't gets me dissociated enough and my mind is watching over what I'm doing/what's happening, disturbing the move...)
Any body else get this feeling with dissociatives (ketamine, dxm...) ?