Maybe its something im doing making it worse, but I can't ever refuel my ships and my economy is in the crapper because my ships fail to transport anything. Even the system with the korobbian spice has 2 planets that ships absolutely WILL NOT transport spice to. If a ship would just show up and do the job it could transport spice to these worlds in seconds, but instead they fly across the map to some colony on the ass end of nowhere belonging to a race I just met with a load of 50 spice.
This has happened on 4 games so far now. As soon as I get the galaxy explored and a decent chunk of space colonized my transportation network goes to shit and nothing gets transported anymore. When I'm still small and aren't trading with any AIs my crappy artificial stupidity traders can limp along 200 cargo at a time and keep things afloat, but as soon as they're trying to trade with a dozen other alien races across the map it gets to the point that tiny loads of 200 caslon 10 sectors away just doesn't cut it for keeping my ships refueled, ending up with all my transports out of fuel - ending up with an even worse transport problem.
Now if I start with max technology and a bunch of super fast highly efficient and high fuel storage freighters things work out a bit better, since they can warp around much faster and use less fuel doing so (thus the 200 hydrogen they haul might actually refuel them and leave a bit left over after they fly 10 sectors to deliver it). But with a slow research game and everyone having slow ships with inefficient engines and hyperdrives they just can't keep up with demand when they're only hauling a few hundred at a time.
Maybe I need to change my setup, but my current games ARE nigh unplayable. Setup is this: Human democracy, 400 stars, starting research, irregular galaxy (evenly distributed stars). As soon as I explore the map my ships fan out everywhere, run out of fuel, and transportation grinds to a halt to the point that I can't even build stations (my automated construction ships pick up half the resources then sit there attempting to build a base for 5 years without the materials, my shipyards stall and never get any ships built).
For instance, I was building a fleet of ships to bombard an enemy planet (lots of bombard weapons) and my shipyard was out of iridium. Instead of a single ship grabbing thousands of iridium (a station 1 sector away is sitting there with 15,000 of it) and loading the station up good so it can finish them all, I have to wait 5 years (not exaggerating here) for a dozen out of fuel ships to slowly bring it in 50 at a time. If I could build military cargo transports I could have just said "Transport 10k iridium to that planet" and had it done in a month with loads to spare for later.
Maybe my problem is building too many space ports? I built one on every system. I guess I'll try a game with just one big space port over my home planet, maybe if I can get them to focus on delivering bulk stuff to that one space port they can keep it stocked up enough that I can actually build ships.
It's not just my empire though, I can sit here and watch the AI traders doing the same thing and all their planets are out of fuel too. For instance, the Securans near me have a large space port in the same system as a hydrogen mining station, yet attempting to refuel ships there fails because their space port is out of hydrogen. I can refuel at the mining station, its just nobody will transport the stuff.
I'm assuming a denser galaxy shape might work better? like spiral? I didn't like any of those maps (seemed wrong to have a whole spiral galaxy with only 400 stars in it), but I'm thinking the closer together stars might ease the transportation problem...