Your flat sucks, actually i would not even try to craft that, but since it's too late: you got a free prefix:
Gain (10–11)% of Non-Chaos Damage as extra Chaos Damage ?
or Hits can't be Evaded for just 3ex, but hanging yourself will be smarter.
https://pvaass.github.io/poecraft/For suffixes usually qual crit + qual speed ... Depends if you play slayer with 8% base crit ascendancy then it will be multiplier