weird shit man.. I have the same problem .. with using anything alcohol related.. everclear.. hexane.. hexanes .. acetone.. all comes out way to dark.. nasty dark shit..
I realized. butane. co2.. propane.. are the solvents making for a good oil..
now I only use the alcohol for soaking stems.. fan leaves and shit for topicals.. or winterizing..
this is weird for me.. because honestly.. I ran some ethanol runs last year.. that was super super light colored amber..
its just not worth it. a closed loop system.. or even just passive.. creates a much nicer product..
ive only had 1 butane run that was weird.. and its been sitting in my freezer for a month or longer now.. I already dewaxed it.. and theres still this layer that's like impossible to get out.. I tried.. hexane and saltwater clean.. tried purging a piece.. and putting the purged oil into water.. to see if the nasty shit would separate.. but nothing...
so back to BHO.. for now.. qwet isn't bad.. but I haven't seen any that matches up taste for taste with bho..