Could you please check probabilities there?

I did a little experimenting after I took this edge (backstab at 87%), and it only worked once in 67 backstabs (I didn't have more time to experiment so far).

Of course, it might be that:
1) RNG hates me
2) +10% to 0.0005 probability does not help all that much
3) my luck stat sucks (?)

But so far it certainly does not look like "significantly increased chance" as it is stated in the help file. More like a waste of edge points

Thanks!