I need more empirical data.. so here I am sharing a bit of my experience but mostly asking for the community's help

Service is the most important thing for me when it comes to WLs. And Ginza has some solid baselines; however, I think I have found a great telltale: if a WL offers rimming then you are in for an amazing service, I am not talking about rimming itself but how service oriented they will be throughout the session.

2 fabulous examples of this are:
J Yuyu and J Ayuna both from Ginza Club (Sorry I do not why today I cannot link them).
These 2 WLs give such an incredible service!!!

and now the question for all of you:
In your experience, more than asking the guy at the counter, more than reading their profile where it is written great GFE, more than reading ARs where people give their take on how good the service was.... if the girl offers rimming (not as an extra) than you have found the highest correlation with amazing service?!