Thank you for the reply, WFab, it caused me to re-think my entire strategy. I did some experimenting with Bias/Gain, multiple selectors, but no change. It turns out, the Clamp node that's used to Normalize the terrain was the culprit (there is a warning that comes with the node referencing tiled builds). Is there a substitute for the Clamp/Normalizer that works with tiled builds? Now the terrain is relatively flat compared to Normalize turn on.