Just found this video from my beloved Hakurai on youtube, he also made the 1-45 in 15 hours guide video. Also with a nice (improve PC performance) part near the end. Maybe it helps for the next wyrm ^^
Im actually going to practice this when I have time, atm doing blackwyrm with FM and even that is not so easy mostly because of the lag but also because of a lot of stupid mistakes by other players some examples are: no summoner tanking with cat please, its breaking the normal rotation of the wyrm and is putting even more stress on the one actually tanking no stuns!!! from any class, again breaking the rotation the aoe needs to be Iframed always, stay behind the boss to avoid frontal attacks or being pulled to him Ive done him now a good amount of times now on FM and I remember an almost perfect tank and not seeing any stuns and tbh its easy then to not die even once. Also be sure to thank the BM or KFM actually tanking the boss, it puts a lot of stress on them and to actually do this for like 15-20 minutes is something you should applaud for