cancerific You have to ask yourself these questions first:
Do I want the absolute maximum amount of damage or do I want some survivability mixed in?
If you want the absolute maximum amount of damage you should use a normal bow and have DEX/CRT/STR as your stats.
If you want some survivability mixed in you should use a special bow and have AGI/CRT/STR or DEX as your stats.
Let's say you want the absolute maximum amount of damage and chose normal bows, you should get multiple sets.
1 MPC clone set:
Weapon: Arcus Lilio s Rossam (DEF: 3 INT +6 MP cost -24% Magic R +12% Hate rise -20% Skill delay -1 sec light tolerance +5% Magic evasion -30%)
Armor: Personal preference since you already get all MPC from other gear and the 3s SD)
Additional: Ardour Chachenez s Rossam (Effect: DEF: 10-16 ATK: 20 INT +10, MP cost -30%, Ailment R +10%, Skill delay -2 sec, Item delay +1 sec, MP heal by defense in low HP.)
Special: Fish-Scale Earring (MaxHP +1000, MP cost -10%)
Low HP set: (use any set, doesn't really matter as long as it gets your HP low)
PF set (maximum damage 1 shot):
Weapon: Elemental bows s Bancho Muscle or Sauro II (if you can't find Bancho Muscle)
Armor: Ira reup s Suishin or Ultimi reup s Suishin (depends on budget and on enemy DEF)
Additional: Daiginjo up s Raton or 15% elemental xtals (same as above) or Monty Beret s Raton or 15% ele xtals (use this against very high DEF bosses)
Special: Adamantite Arrow s Suishin or Telon (same as above but generally Susihin is better because you can also use it in DPS set)
AL page: Ouvel, Arick, Mamonea, Teo, Gatekeeper, Sauro II, Vatendeth (pick your favourites but Vatendeth is the best against high DEF mobs and Ouvel is also a great option since oyu have a lot of critical damage already)
DPS set (switch to this set if you can't 1 shot and want good DPS through DOC spam):
Weapon: Sauro Shooter 5 s Muscle Colon (ATK: 297-302 ATK +19% Critical damage +5% Magic evasion +8% AGI +10 CRT +10 Skill delay -1.7 sec fire, water, wind, Earth elements to the physical +2%) or Elemental Bows s Muscle Colon
Armor: Ultimi reup s Suishin
Additional: Monty Beret s Raton or 15% elemental xtals)
Special: Adamantite Arrow s Suishin
AL: Cheltil, Sauro II, Maelriel, Gatekeeper, Ouvel (gives you the 0.1 s sd you need from 1,7 sauro shooter and 1,2 from Monty Beret to turn it into a full 3 s)
Abilities: Use full QC to achieve 9 clone DOC spam