I had upped the FO but had tested it with my papercore 51-32-18 and it was a little weaker flame but full melt pool and has done beautifully. I've been letting them set a minimum of 48 hours (first 24 in cooling in room temp, second 24 they are moved to my storage which is a slightly cooler area.) I was using a 8,10, and 12. I was pretty sure I was being silly using an 8. I will redo the 12 and do a 14 and see how it goes. The square jars are squat so maye it won't get as hot? Oh and they are the German LX coreless. Best part was (as I hoped) they didn't seem to have that stinky burnt smell after they went out! the paper seem to put off an odor