Hello Ray, any chance you could make an example of how to flatten elevation spikes?
There are quite few different ways of doing it; the easy way is to patch up the original elevation model used to make the mesh with another dataset; for example if the mesh is dome from aster dem data; you can download another source such as srtm and cut that bit of terrain out using microdem or qgis software - any of the two can do it
you than load the original elevation model and on top you put the patch you cut out from the different source; usually spikes are caused by bad datas; but with geoconverter they can pop up here and there even without bad datas.
microdem can do anything you want and need really and is free: a video to give an idea
this is a good video to grab the principle: