Summary to the problem is :
Don’t scale too much your original Tpose meshes and then import it on Zbrush.
If you use Tpose and try to scale the original subtools with the Tpose to Subtools method, it will screw up the subdivision levels.
Attachments
Once again, found myself the problem :
If you scale up your zbrush subtool after a certain threshold, it WILL screw up your subdivision levels, leaving undesirable results.
I did that because I needed to use a Marvelous Designer size. I should’ve scaled down BEFORE importing it back into Zbrush.
Horrible mistakes happen if you don’t have the size into consideration.