Chris
This is actually a known issue that I have been working with respect to MSE Walls - and I am surprised that your 3D Surface looks like it does - you can also see that the lines that follow the steps in the footer are also not correct not just the outside boundary line. The issue is that when you have vertical steps in the Footer VAL or in Tables that define the Footer lines, there is an internal tolerance of 0.3' between two drops computed from Tables or Instructions or VAL points that stops the Steps forming correctly (that is why I was surprised it looks half decent in 3D as normally the steps are all screwed up. The fix is to drop a template at each Top and Bottom of Step station using the reference template to the one that you have defined (this is a lot of Template Drops) but that does I believe work and solve for this problem as a work around - I have had this a few times in the last few weeks and it has worked in all instances. Karl P from Denver was the last to ask this in your team.
I have a meeting with development to discuss this again this week as I thought we had addressed it, but maybe that did not make the patch as a fix or maybe we just did not fix it yet (I will find out).
Let me know if the work around does / doesn't work and I will drill deeper.
I guess Densification helped you, however the Explode function appears to be affected by the known issue. Template Drops are forced output locations no matter how close together they are, whereas Table Entries or 2D Line Entries are affected by te 0.3' tolerance issue (why 0.3' dont ask me ....) but I will try to get this fixed in next update
Alan