Its not like this
1. First (and most important) need to count dmg price (and weapon inflation in period). In this method - DW weapon most worst weapon in game. Can invest adena, can invest $ from l2 store, can invest RTM adena. But 5000$ for weapon (or more) its ridiculous for some % dmg... DW weapon in fact just for top gamers - for PVP, and nothing more. TOP PVP gamers = TOP $ spenders or (mostly) nolifers (they not have job, 30-50 years old, living from game).
2. Only one thing what need to change... can use less attribute.. (DW have 500, 750, 999). After no changes at all. For all weapon setup the same
2.1. PVE/PVP (or just dmg) bonus.
2.2. Skill power.
2.3. p.atak, m.atak, atack crit dmg (need to count chance of crit - and check priority skill power, crit dmg or atack)
2.4. m.atak, p.atak - this is last stat which need to see.
That"s all.
With any setup DW wepon will make more dmg. Diference can be just from mobs and geodata and in which way/line using skill's (which skill's to use say skill reuse, skills cast time)
For example: with +18 r99 PVE for me need ~15min in solo instace (115lv), with DW weapon ~13min. So can feel difference.
with +18 r99 PVE im geting ~6100 kamaloka event items (110lv), with DW weapon im geting ~6100 kamaloka event items (110lv). No difference. Because kamaloka instance have very bad geodata and mobs are maked for mele dd.