Sorry it took a while to get back to you on this, RL has been just a tad hectic lately.
Unfortunately, now that I have had time to look at it, I really don't know the answer for sure. In all states, assuming all tech was known (including all stellar manipulation techs), there should be a minimum of something in excess of two hundred ships. The only thing that I can think of is that it thinks it is in infrastructure mode, which would only build 81 attack ships and 32 (33?) carriers for for 162 planets, and it is not building all of the supporting (especially stellar manipulation) ships. Then again, who knows what the AI is really doing?
One of the trickiest parts (at least for me) of setting up the ship construction file for an AI is setting up the builds so that it doesn't bankrupt the AI in the early-to-mid part of the game, but allows the AI to grow to maximum strength in the later game. I've noticed in the past that the Rage usually starts off very strong but slips back in the later part of the game, and this may explain that to an extent. They are usually pretty good at keeping their economy stable through most of the game, but that may be reducing the amount of ships built later in the game.
Hmmm... It is about time that the Rage gets a rework to use the new SEIV Gold features more efficiently. Perhaps I will look into ways to beef up their late-game fleet.