Oh it's definitely not impossible at level 100. I did it at level 92. Yes you should try again. Watch my video of my beating it at level 92, http://forum.tip.it/viewtopic.php?t=416757. When the 360s, 180s, and 90s come at the same time, have protect from magic on at all times and wear full guthan. Run around until you have the level 180 stuck behind the 90. Kill the 90, then run to a safe spot and range the 360, and then kill the 180. If you don't know where the safe spots are, I'm going to put a video up shortly of the last half hour of raw footage in beating the fight caves so you can see what I did.