Legendary Cube rates on weapons too high?

I personally have not legendary cubed a weapon so far, but from every person who has, they seem to all have easily gotten multiple lines of boss damage. Im not a pessimist, but everyone and their mother getting 60%+boss easily on their weapons doesnt seem intended. Heck, a friend of mine got multiple lines of % boss 4 times out of 5 cubes that he used. This is making me think that either the % boss rates are naturally supposed to be this high, or that nexon america accidentally made them so. Can anyone in KMS confirm or deny this?

as i said earlier, there are 4 lines of boss% out, you can get 3 of them on the first line (40 to 30 iirc) and 2 of them on the other 2 lines (30/20) assumming you don't get 2 legendary lines.

there's:
40%
35%
30%
20%
30% ignore
35% ignore
40% ignore (not sure on this one? lazy to check fiel's module)

there's just too many lines to chose from, if you see several people getting more than one line of 35% of above though, then yea, something may be up.