welcome to the nexus!  i always smoke the yellow goo that i separate from re'xing and i find it is always an enjoyable experience(much stronger than the clear xtals).  from my understanding that yellow stuff is almost all nn dmt stuck in some fats and oils but still solidifies and possibly a tiny bit of other alks.  the weight is much heavier because it is more dense so eyeballing doses can be deceiving, you get much more than you think. so maybe the yellow stuff in your ecig is allowing you to vape more at a time. it seems to be a bit more heavy on the lungs though but is soo much more visual and easier to break through on. looks like ill be trying this in one of my old ecigs i have laying around