where can I find where the speed values are changed in the actual game files? I tried this and the small ship speed 1000 mods on a server of mine, but even after removing the mods from the mod list for some reason the speed limit is still increased. I may need to manually alter those values

Ahh well I appreciate the explanation. I didn't have a proper understanding of the mechanics fully. When I used your older speed mod, it didn't work at all. I don't know if maybe I placed it out of order, maybe something conflicted with it or if there had been some kind of restrictions on the maximum speed limit for ships because of the planets. Everything is fine now it seems. Sorry for the trouble and I appreciate the speedy response.

What exacly do you mean by planet friendly?

Speed mods only change the maximum speed limit for ships.
There are two modifyable maximum speeds, and they are for small ships and large ships.
Speed limits are not affected by planets (as yet).

The problem however, is the planetary lander ship used to spawn and land on planets does not have enough thrust power to slow down from speeds greater than about 125m/s.
If you increase the maximum speed cap, the lander will plummet to the ground unable to slow itself in time.
By leaving the maximum ship speed at 100m/s, you have an artifical Terminal Velocity. The ship cannot fall any faster than the maximum speed limit.

Are these newer speed mods planet friendly and such? I tried one of the older ones recently, 500m/s one for all ships specifically, and it did not work.