XTRO Comstar
Page 6, Exterminator
According to TacOps p. 336, The Null Signature System takes up one critical slot in each location except the head.
Change NSS Critical from 8 to 7
Under Notes, append "except the head" to the line "*Null-Signature System occupies 1 critical slot in every location."
Now it won't have two things crammed into that one available slot in it's head!