like all know sk its a pvp tank...its the best defender of a party coz of his cubics he never be debuffed...and i guess its the best tank on l2...not including paladin...he is not a fully tank..its like fighter/tank/bishop :P...if u play high rate and u have max crit rate...use sword woth health if not use focus...add dex dyes...he already got lot of str..thats why he crit so hard =)
btw dont forget use TOD ( touch of dead ) and shackle on oly =) and about buffs try what carebear says.. or just get figther buffs.. "death whisper, focus, might, guidance ( since he dont have good acc ) and haste...