From what I can figure out, 108220 is the trash version, which triggers the stacking 109389.
105171 is used by Yor'sahj, and triggers the stacking 103628. Will give it a try on Sunday. If those are in fact the right IDs, that solves the problem perfectly.
105173, 108347, 108348, 108349 and 109390 are the explosions. As far as I can tell, the stacking debuffs don't actually trigger the explosions directly, but rather trigger a server side scripts that casts the appropriate explosion spell depending on difficulty setting. That would explain why there are five different versions of explosions (LFR, 10N, 10H, 25N and 25H) but only one debuff.