Hi danielrhall,
Yes … the Eurotop does have this additional advantage of flipping and replacing the layer that will tend to wear out the fastest. I think that you will feel more than just the top 3" of the mattress … especially with a 14 ILD and your weight … but the topper along with the quilting layer would certainly be most of what you feel. The topper itself is the layer that would wear out the fastest and more quickly than the latex in the mattress itself though. The topper will increase the durability of the latex in the mattress by absorbing most of the mechanical stress from repeated compression.
The thicker layer does have one additional benefit that most people wouldn’t really feel but would come into play more with higher weights which is that it would compress from soft to firm a little more gradually which can be of some benefit for higher weights and sleeping styles … even if the “feel” would be the same. There is more about this in post #39 here.
Phoenix