Thanks! Now I can be sure that my set is representative.
I guess since these things are all legal, the mystery is more in what's going on in these sets.
With the 3 and the 2 turn, the TC templates travel nice round numbers on one axis, 100 and 75 mm., but that just makes it weird that the TC 1 turn only goes 48 instead of the 50 you'd expect, and the FFG one is a clear 45.
Judging from the FFG ones, the banks seem to be made so that with the slightly shorter distances on the TC, two of them put together will travel 90 and 140mm for the 1 and 2 along an axis.
So the one turn is what's going to stay a mystery. The biggest impact of this difference seems to be that we'll need to leave a small bit more lateral spacing between our ships if we want to turn in formations, since the inner side will come a little closer. I'll look at some other combinations later.