Try the Pink Noise for a night or two.
TBH though on a inexpensive pair of IEMs you probably wont notice much of a difference because of the lack of what you can already hear to begin with. I know with my everyday beater jvc marshmellows, even modded, "burning-in" did nothing.
As crazy9000 said, alot of burning in is really just adjusting to the sound signature of the drivers, if you were not listen to another set every day for 1 month or two and went back to them your almost gonna be right back where you started.
BTW CRAZY! -> nice dac =D