There is a simple way to boost the Ranger's DPS. You can reach 550+ DPS with Fokused Fire....
First do feat reset , then learn Sniper Stance activate it and do feat reset.
Do this with all 4 Stances . The Point is you must learn all 4 Stances after activated the 4 Stances otherwise you will lose the Stances after Zoning/Teleporting. In fact you must have a hybrid build like this---> Feat planner | AoC DPS
NOTE: If a Guard or a NPC Mob kill you, the Stances will reset. So be sure no Guard or NPC Mob kills you. Also dont klick on any Stance while you have all 4 activated. This Exploit works since long time and i also did report it to Funcom, so it will be gonna fixed soon! This Exploit is rare , not many Ranger's used it , i wonder why this Exploit isn't released in any AoC Forum's.
Have Fun!