flyingchanges,
so, about .05 Vs more than needed then (+/- 6kts? ) hence the bigger difference between Vref40 & 30 on the 800 than the Classic. And, if this isn't the case on the 700 (never flew it) possibly added, as I was told, to give greater tail clearance margin on the longer frame.
900 has 2 position tail-skid, so maybe they didn't bother?
2 position tail-skid an option on 737-800 Short Field, but my employer didn't tick that box , so don't know if it reduces Vref30 by a commensurate amount. . doubt it, as if it is a short field you are going for . . . well, I guess you will opt for F40 landing.