I had that trouble too, all I did was switch it with a ship that already had blindfire. Even then when I tried to use it, it wouldn't work until I pushed the F key to cycle the full guns off. I hope this helps. I am still trying to get a ship into SL. One of guys on here is helping me by e-mail. I'm getting closer but still having trouble importing it into the game.

Unfortunately, BlindFire isn't saved in the Ship files. Currently the only way to have a custom ship have BlindFire is to switch it with one of the original ships that has it.