6/6/1/1 if using sbl (barely ppl do)
6/5/1/1 if using other weaps.

the reason of 2 slashes is because 1 slash upgrade is 10 extra dmg and 1 extra slash is round 100 dmg i think (uncrit)
the chance of ur second slash landing is very small but vs nubs u can do it if u know the trick.