Rory - Your very explanation about the hole at LCC is the why the front of #8 at RG was not raised. The amount of disturbance to the 15th at LCC would be significant as would the 8th at RG. #15 at LCC has a more gradual upslope that #8 RG yet we advised against doing anything with your 15th. Same for the 8th at RG with the exception of capturing more cupping area to the right into a level area. Our intent when raising the front of the green is to mimic, as close as possible, the existing approach slope. That means there may be 50 - 75', or more, of area that must be modified beyond the green so as to maintain a very similar slope.
The 15th and 13th greens are RG have very steep upslopes leading into them. The option of running a ball onto those greens is near impossible. The overall average slopes of each green are pretty bad. #13 5.66% avg slope with 3.2% of a 5600 sq ft. green being below 3%. That's 180 sf of usable area below 3%. We had to too something to create more cupping area. The 15th was not a severe as the 13th with the average grade being 5.4% slope and 38% usable area at 3% or below. Problem with the 15th green was the elevation change and length of the slope from the rear teir to the lower front portion. There was only one area to cut holes on the lower level and it was very difficult to stop a ball when putting from above to the lower level. The green was modified by cutting into the base of the tier allowing for some lowering of the rear portion of the lower level, then we raised the front of the green. By steeping the slope of the tier this allowed for less raising of the front of the green, therefore not creating an even steeper approach. So instead of raising (don't recall the exact numbers) the front 12" it may have only been raised 6" at the front.