Bob:
In my opinion, it doesn't matter whether the area of any green on the golf course that goes over the top first and you want to keep as reasoanble, functional and effecitve is a slope or a contour---whatever it is that's the area that determines the "reasonable maximum" speed for all the golf course's greens.
What you do is keep lowering the mowing height on the course's greens while watching the playability carefully on that spot that goes over the top first. At the mowing height that spot begins to get dicey in playability is the mowing height never to go below and the greenspeed the club will never again exceed! (our mowing height right now, by the way, is right around 1/10 of an inch!!).
We've been using this procedure to analyze carefully our "reasonable maximum" green speed for about a month now at GMGC. The process is interesting, the membership offers its feedback, you factor all this in and get to that point of a "reasonable maximum" speed. When we hit that point---and it looks to be between 10.25-11 at our course, I'm submitting a proposal that the club, in their by-laws resolve that speed will never be exceeded in the future and that green recontouring will never be an option! If they put that into the by-laws, I'll shoot all the grades (slope and contour) on all our greens!! If anyone in the future says they've changed somehow and need to be recontoured and softened all we need to do is go out and reshoot them to tell!!
The reaction to this entire process amongst the membership is very interesting. As we took our speeds up only 12-18" the membership thought we were using new and more difficult pin positions. We weren't, it just felt like it due to that seeming minimal increase in speed, which I'll say again can have an exponential effect on playability of perhaps 500% in that one foot differential of 10-11.
In my opinion that 10-11 foot range on the stimp is immensely significant in golf!! At 10 the speed is fun and pretty sporty but at 11 on greens with any kind of slope or contour it's sort of another world in playability. The reason is basically simple--at 10 the greens have just enough friction but at 11 there's very little friction and the effects of "ball creep" absolutely explodes and makes playability a whole different matter.
If you ask me no putting green in the world needs to exceed 11 on the stimp and some greens, or parts of them, can't quite reach that level without getting crazy.
An interesting note from our procedure and experiment was that Stan Zontek, our regional USGA agronomist, brought a few supers and agonomists from Europe over to GMGC during this experiment and they all played the course with our super. Those Europeans said there aren't any greens in Europe that run as fast as ours (they were close to 11). They also said our new A-4 surface was the truest and smoothest they'd ever seen!
All of them, including our super and Stan Zontek thought the speed was a little ridiculous in playability! But the amazing thing is very few of our members have really started to freak out yet. I think over time they probably will though, and then all we'll do is pull back on our speed some and set our "reasonable maximum" just a little slower!
The interesting thing (and perhaps frightening thing) is this new A-4 grass is virtually stress-free at these speeds or probably quite a bit higher compared to what preceeded it. The good news is up until recently it was thought that the new A and G strains HAD TO BE maintained at super speeds or they wouldn't do well. This has been proven not to be the case.
The other interesting thing about the new A strain (A-1 and A-4) is it just loves dry conditions so firming up the green surfaces too is so doable!!