Yeah I noticed the torpedo firing problem too. I've glanced at it but haven't given it any serious thought on how to fix it. To be honest I've been trying to figure out how to put a snorkel and ESM suite on it lol.
I may look into this more as it might be an easier task. I'll re upload it with the English translation too. I might talk to the original creator and see if they mind me making a few changes in general. Make it more like a real 688i with a couple of things.