As you've already seen, there will most likely be several small groups to choose from. I typically lead a group of "moderately spirited" riders. By that I mean I do enjoy a quick pace, but I'm generally not exceeding the limit by more than 20% or so - I just try not to slow down much for the curves, if at all. If you've ever read "The Pace" by Nick Ienatsch (
https://www.motorcyclistonline.com/pace/ ), it's a decent example of my typical ride except I'm nowhere near the rider that Nick is, so my "Pace" is a few notches down from his.
Also, it cannot be stressed enough: Everyone in a group ride must ride their own pace. Don't worry about losing the group. We will wait for you at the next course change. This is another reason I try to split riders up in to smaller groups of similar paced riders. But even if you're slower than your group, DON'T WORRY ABOUT IT. Seriously , we'll wait for you. If anyone has a problem with that they shouldn't be doing group rides.