Simple for example:
How should work: Use Triple sonic slash hit 3000 dmg normal hit, possibility to crit for double dmg meaning 6000, critical rate of all duelist skills influenced by STR, Damage influenced by P.atk only. No posibility fail, misss or do half damage meaning 1500 instead of 3000, and not possible to get blocked by a shield aswell, triple sonic / double sonic slash ingnore the shield defence and block rate.
other skills ranged skills or AOE skills the same they CANNOT FAIL OR MISS or do half of the regular dmg.
How it works here: they Fail / miss the critical rate of the skills i don't know what is influenced by but in 4-5 matches in oly i didn't do 1 critical on a single big skill ( and with +5 STR dys and +2 STR from set you should do 2-3 big skill crits / match), and the p.atk / p.def compensation i don't know how you calculated it here, but the damage is also a bit weak