As discussed in all other threads about this, whenever you see an elevation problem with KLAS, and you have something from OrbX installed, the issue it entirely unrelated to FSDT KLAS: the problem is caused by OrbX, and they made a fix for it.
There are NO OTHER ways you or we can fix this. The fix from OrbX doesn't change any of our files. It changes they own files. We even updated our Live Update to recognize the OrbX fix, so it won't be removed if run it, so there's just nothing else we can do and, as you can see on the OrbX forum, the problem is fixed, when you apply their latest fix correctly.
I don't know precisely what their AEC tool does, but a while ago it was reported that, although is advertised as a P3D4-compatible product, it wasn't updated to recognize sceneries installed in the proper P3D4 way: using the addon.xml instead of the legacy scenery.cfg method, so you had to add KLAS manually to the list of airports to be fixed.
Again, since the problem (or problems) is caused by OrbX addons, and they DID a fix for it, it's best you ask this question on OrbX forum.