upgrading commerci equips to sweetwater

my current equips are good actually, raven horn set, and my range is around 65k. but still i cannot kill the dragon boss during the allocated time! i am able to kill the other boss, grosso something, but it doesn't drop any sweetwater equip !!

btw, i cannot find the sweetwater equips in the market anymore !! when i search for them in maple.fm i can barely find one ! no hats no shoes no weapons !! is there shortage in these equips in game or what xD