Dan,
I know you have said the rules on page 37 of KA-n is incorrect and a disruptor should be range 18 overload range 9. I have been going through the ship displays for the KA-n book and note that the E4 and F5 have a disruptor range of 12 and an overload of 9 while the FD7 has a range of 18 but an overload of 12. The Kzinti FF also gets the short ranged version.

Looking back I can see the E4 and F5 had shorter ranges in Admiralty Edition but the FD7 and Kzinti FF had  'standard' Disruptors. From my Starfleet battle stuff the Kziniti FF probably should have the shorter range but is the FD7 correct?