You could start afresh with a new library, having deleted the original.
I tried creating a fresh library, but daz still loads the base character plus morphs from the original path.
The next attempt I made was this.
WARNING: This needs to be done very carefully, to prevent mayhem. *****
I know which data files belong to what from my custom 'Inst' files.
Targeting the characters with the heavier morph files in the root path, my next move was to uninstall them.
It is not a magic bullet, but the encouraging thing is this seems to be working.
I can always re-install those heavyweights again, if I need them from the 'Inst' file.