You mean S18 (instead of S8)?
Anyway, I do have 919 P and G, and then S18 54* high bounce and 60* low bounce as my current gamer.
Originally I wanted to have S18 all the way from P/G/54/60. But the fitter convinced me I should stick with 919 on P and G. So I did.
In terms of forgiveness, the 919s are better. But in my personal experience the S18 gives back more positive feedback in terms of impact feel and sound.
919 wedges feel more soft on impact thu.