Ship strength doesn't scale particularly granularly on a ship-stats basis.
But even if it did, the fact that each game has a somewhat different balance is ok, and even helpful to replay value. Btw, it does put the AI HWs about as far from you as it can, though it makes no particular effort to control the distance one wormhole exit-point is from another on a planet.
Sure, that means sometimes you'll get the short end of the stick if you go for a victory condition that's less favored by your particular map seed & config, but that provides an opportunity for one of the most fun things I've found about this game (in my experience and others) : taking a situation you don't know how to solve, and solving it. There's a tremendous amount of difference you as a commander can make by using all the tools in your toolbox in the most efficient ways possible. It's not frequently necessary (or else an hours-long campaign would be too grueling for all but the hardest-core players), but when it is the resulting problems and solutions can be quite satisfying.