dragonedge as you level another skill it will delevel an already leveled desynth skill regardless of the 300 point cap, there is a work around by switching between your desynth skills and performing successful desynths ie
bsm bsm bsm gsm wvr bsm
this will lock your desynth skill for the space of 3 or desynths but this is not only costly but takes up valuable inventory, we really should not have to do this, imagine leveling warrior and watching your white mage delevel..