" I don't really know how to describe it, but instead of my eyes being forced shut they were forced open & I felt/looked completely alien."
This sounds totally normal. The spice is not predictable. If you think it is, I am sure you will probably be surprised in one way or another down the line. That seems to be it's nature. It never seems to fractalize a shooting star neuron sequence passed the same area of the blood brain barrier. Now what if we could map that?
For people who are just not getting there, I always recommend experimenting with basic things like prior exposure to darkness for a while before going in, holding all of their hits in and clearing their bowls of course, as the spice melts and saturates to the bottom- and not burning it of course. 20 seconds is a good range to go for each inhalation in my opinion. Some meditation prior to vaporization aids in slowing the breath and heart rate thus calming the mind.
With these down, if you are still not satisfied, experiment with synergy. I personally have always gone "deeper" with synergistic combos than just straight N,N- sober to hyperspace in 60 seconds flat. That method is not one I would recommend. For example, I like to dose LSD, then a few hours later drink ayahuasca, then when that kicks in smoke a dose of N,N-. The results are ... inarticulatable.
Here is a list of other combos people have contributed to the wiki.
That's my advice. Keep up the explorations.