Yeah, that's what I think. However, if it could hold 9 S3 torpedoes it would then have other purposes. Would be perfect for ambushing fighter squadrons. S3s are hard to shake and if you don't have much warning, could mean serious trouble. If three of them fit in each S9 slot and could be launched together at separate targets, would provide a devastating surprise in battle. The smallest bird that can carry an S3 is I think the Vanguard, and they are not hard to spot. The Eclipse is very hard to spot.
If you can make a drug container that loads like an S9 torp, would make a great smuggler's ship. There are always other uses. . .can you fit one or more X1s in the torp bay?