How much do jump torps cost? How many times can they be used? What range do they have?
Make them 5MCr each, limit them to jump 1 and say they are one use and suddenly the reusable x-boat makes a lot of sense for your communication network.
If you've got a rulebook with Jump Torps in it, you also don't need the freaking X-Boats, anyway... as you can build 100Td J4 2G couriers under Bk2-'77.