Something isn't quite right, in the sense that the breaking is not consistent. I loaded the V4 Bodysuit onto Vicky and it superconformed. I made some changes, deleted some morphs, hid some others, then saved it back to the library. Loaded it back onto Vicky, and it still superconformed.

I looked at the cr2 with a text editor and saw that the numbers that are supposed to remove superconforming are indeed there:

interpStyleLocked 0

valueOpDeltaAdd

Figure 1

BODY:1

FBMAmazon

deltaAddDelta 1.000000

And yet the bodysuit still automatically conforms. Other pieces of clothing behave just the way you describe. They lose their SC the minute they're saved back to the library, whether any changes are made or not.