A good scale is pretty important IMO, you could be dosing low, but other problem is without scale you can end up dosing to high if you are just guessing you need more. This can lead to some pretty frightening experiences.
I've not used the key but wonder how close you have the lighter, you aren't trying to touch the dmt with the flame are you?
Black then white are all I see in my infancy.
Red and yellow then came to be,
reaching out to me, lets me see.
There is so much more and it beckons me to look though to these,
infinite possibilities.
As below so above and beyond I imagine,
drawn outside the lines of reason.
Push the envelope. Watch it bend.