First of all, if majority of server has fire resistance it is vewry stupid to put fire on weapon. Since you are SK, your element should be Dark (skills u mentioned, Leech life and so), but you can use other elements on other weapons (on bow, hammer).
on armor use holy,earth,wind, fire and water resistance. SK is very offensive tank, so going dex+/str+/con- is kind of wrong. u need that con (to save u against many stuns/paralyses). For olympiad i would use dex+/str- with Warrior-haste, Enchanter-barrier and Summoner-spirit. for PvP with full buffs u can change dyes to dex+/con- and str+/con-, but dont go too high.
think about this and try it