well i know that
1) wind magic isnt exactly strong so obviously u wont be seeing big numbers especially at early stage.
2) illusion dagger is a lvl 20 skill, wind cutter is not, try to see if cyclone cutter is still weaker
3) dagger skills are pretty useful early on for mages, because they're stronger and help u kill faster. even at lvl 60, my fire mage did about 2.1k critical with fire wall, and 400 x 4 critical with dark dagger (mgc 271, str 91) but the more u lvl, the more u'll notice that ur dagger dmg wont cut it anymore