That was the final score - what I'd done was replace every card in my deck with a LEN^LEN card once those initial 4 cards came out, so I could guarantee the perfect setup. After that, future scoring was negligible.
The problem does not seem to be what I thought it would be, I'm currently investigating, do you remember if you specifically tried to look at the "turns" graph from the game over screen or if the error happened as soon as your game ended?