When I played the Stock version, high TC was an iffy proposition. I had to learn where the danger zones were so that I could maintain, at least, a 2048X speed. Once I hit the dead zone, I had to slow it down to as little as 256X and even then, a collision with a friendly ship was always a possibility.
High TC in stock, for me, was like trying to dance the Irish Jig to Rap music.
There was no rhyme or reason in it.
Since I've been using the mods, I can TC to my hearts content, knowing that I'll immediately drop to 1X (or normal time) as soon as a ship/plane is spotted or detected.