Now what's needed is a rocket that flies out of the silo really slowly, rotates to the appropriate heading, and after 1 km fires a second stage, which then rushes towards the target. Later the second stage explodes launching 10 Helios warheads. The missiles are also definitely large enough to have a subspace drive.
For balance each launch tube should have a single missile, and there should be a few plot elements such as resupply missions after every battle, some of which fail leaving the silos empty for a few shootouts. The torpedoes could be fired only at TAGed targets too.