Hi Again,
I have been off work on sick leave so I have had time to try and work this out.
I can make the spikes go away…
My normal graphic settings has Terrain Level of Detail set to 150. I have a RTX4080 and use Frame Generation and only really fly the PMDG 737 or the Fenix A320 and settled on that setting when I first bought the 4080 as I could not really tell the difference with higher settings however it allowed essentially everything else to be on ULTRA and smooth performance. 200 could be a bit glitchy with those airplanes. 150 not so.
However it is Terrain Level of Detail that can control the spikes. I sat and thought about it, and said to myself it is a terrain issue, so I looked in settings and I have a terrain slider, so I started moving it increments of 5, backwards from the highest setting of 400. At 400, no spikes, and I have no spikes until I get to 250. Nudge up to 255, no spikes so that is the sweet spot for the add-on however, most of us probably don’t use MSFS with Terrain Level of Detail that high. I would assume most users would leave it at default 200 or maybe bump to 250. 255 is an odd number to remove this issue however, there it is, on my PC, 255 is the integer that removes the spikes.
I hope this helps. I am sure you will fix it just as I go back to work! Which will probably be on Wednesday…
Cheers,
Mark