On my work I haven't tried Coleman gas with methanol; so I don't know how it will mix, but from what I 've can see is that probably your methanol is contaminated with water It happened to me before where I was getting a lot of dissociation of the mixture for using an old methanol can that I had stored for a long time, methanol is very hygroscopic which it means that it will absorb moisture even from the air, and I know for a fact that oregon has a very high humidity index or am I wrong? try making your combinations with fresh methanol if possible and see if you get any change in your results, Oh and by the way don't use coleman fuel it contains some other ingredient that makes the mixture rather impossible try the walmart brand I think is called ozark or something that is pure white gas fuel, you can also attach a tube to the end of a starting fluid sray nozle and spray the fluid to the bottom of your fuel mixture and see if it mixes, ether disperses water that 's what I was using when I had that bad methanol and it helped with the mix stability.