I like the general idea of the slowing, but I think it needs a bit of tweaking yeah. Giving the player a bit more room to maneuver scouts without slowdown would be nice, and going to 70k or so might be enough for that. Then again, I wouldn't be that against something like 60k> => <32, 80k> => <16, 100k> <= <8 to start slowing down the transports quicker, but still give scouts a decent amount of speed in the 60-80k range. Since most fleet ships are <32 anyhow, this would give the player the 60-80k range to maneuver in without slowdown in most cases as well.