I found a way to fix the white peace beeing signed too early by the AI (like Italy vs Ethiopia or Japan vs China).

By default this mod check after 2 months if any country has conquered land, if not, they will sue for peace. 2 months is not enough, you d'ont even have time to try a naval invasion.

To fix this, open .../Steam/steamapps/workshop/content/394360/2125981517/common/scripted_diplomatic_actions/dyp_diplomatic_actions.txt

at line 186 & 187, change 59 (the default 2 months) to whatever you want
at line 190, change 60 to what you put on the previous lines +1

at line196 & 197, you may want to change 119 to whatever you want (default is 4 months)

repeat previous process at line 251, 252, 256, 263 & 264