You need to stop insisting wanderers leeching off FATEs were the ones responsible for server progress. They weren't. 99% of them weren't contributing a darn thing to the worlds they were visiting except congestion.
The lower pop servers are taking longer to progress now because EVERYONE was taking longer to progress on Stage 3. The number of contributions required to fill the bar is significantly higher than the other stages. Balmung had stages 1 and 2 knocked out in a day but took 2 days to complete stage 3. Seems like it would make sense for the low pop servers to take twice as long to complete Stage 3 as well, right? And that's exactly what's happening. With the possible exception of Spriggan, every world will have its Stage 3 completed by Tuesday, only one week after the content was released. No one is falling behind anything because there's nothing else to do.
Is there no one else alarmed that content intended to require ongoing server cooperation has been completed in such a short period of time, so short that many players never got a chance to participate and watch the progress happen? Sure, they can continue to turn in items for scrip and rewards but they missed out on seeing things change. It's hard to get excited when you feel like you're only being allowed in after the party is over.
SE should know that a large portion of the player base has little self control when new content is introduced. They're going figure out the most rewarding, less effort portion of the content and latch onto that to get what they want. They're going to consume it as fast as possible then complain there's nothing left for them to do.
That type of player should never be left dictating how long content lasts because they've now cut the rest of the player base out of that content.
It would have been better for the first stage to be the longest stage to give all players a reasonable chance to get involved and see what was going on before the visual progress started getting made, or at the very least make all stages of the project phase last the same amount of time.
As for the FATEs, the Concerted Works needs to last far longer. Make them last a week with FATEs occurring every 2-4 hours to give all players a reasonable chance to participate. Kill the XP and scrip rewards to 10% of what they currently to bring the reward to effort ratio more in line with what we get for the contributions that actually count toward progress. There doesn't need to be visual progress after every FATE. Set it up to occur every 10 completed FATEs or something similar.
Honestly, none of this was well planned out when player habits were not taken into account for the stage design.