well not sure if I can help or not, but..I have been using gb415 and love it.. have you tried to use less FO? 10% seems like an overload. I usually use about 6 maybe 7%....I heat mine to 170, mix everything in and pour around 105..I do have to put the heat gun to the top to smooth it out but no biggie there... I am currently using htp 83 wicks and they seem to be doing good...of course I have not used the size jar you are talking about though.. I would start by lowering the FO a bit, it may be to much for the wick..(so I hear)..