Archery is the most powerful fighting skill in terms of dps.
You can reach 58.5 dps with a Composite Bow and only 49.1 with a Bladed Staff. But if you are not able to upkeep 1.25s then you drop to 48.8 dps. You also need to leach enough mana with 50 HML cap on ranged weapons.
You need 221 max stamina, 150 dex without potions, high HSL, 120 chivalry (to cast DF), some FC (to cast DF fast), 55 LMC (studded suit), 50 HML (reforged).
And even if you satisfy all those conditions it will be difficult (or even impossible) to keep 1.25s and chain AI vs some monsters.
P.S. Listed dps numbers don't take in account chance to hit. So you also need HLD on your weapon (may be instead of DI).