First off, mnk obtains 207 guard at level 61. Secondly, The Korrigan in TBT are 72-75. You should be able to go 260+ in TBT. Remember to use as much guard skill + gear as you can. You want to have guard skill as far beyond that what would correspond to the level of the mandies as you can (So for Korrigans i would shoot for nothing less than 280).