Remove level cap tomestones as a reward. Congestion issues solved since the majority are only showing up for the quick and easy level cap tomestones and not because they're interested in the Hunt as content.

Change the A Rank respawn timer from 4-6 hours to 3-8 hours. If respawns are staggered more, players are more likely to engage them when found instead of waiting up to 5 hours for a conductor to start a train. More spontaneous kill parties being formed also means reduced congestion since fewer players will show up.

Remove the ability for third party plug ins to detect S rank locations from anywhere in a zone before it is pulled. Continue to broadcast the "you sense the presence of a powerful mark" for those in the zone where a S rank is present. The spawning community is good with sharing information about spawn locations and what spots have been eliminated through A and B Rank spawns. The inability to see the S rank from across the zone will only be minor inconvenience as long as there continues to be the zone broadcast saying it has spawned. It will be a bigger inconvenience for those who have come to rely on their third party plug-ins for alerts before the general community gets relays.

Reduce the number of kills required for the expansion level achievements that reward mounts. The high counts also prolong the periods of congestion for hunts. Players should be able to earn these rewards during that expansion by playing a sane and healthy number of hours per week on their home worlds instead of playing a degenerate number of hours and/or constantly world hopping to add to queue and zone congestion. Looking at the math shows the problem.

Depending on how many of the expansion zones are instanced there are 6 to 18 S ranks (not counting the SS since that doesn't appear often enough) that can be spawned roughly twice each week. If we assume across the course of an expansion there will always be one zone that is instanced, per world that's 832 possible kills a year or 1664 across the course of a 2 year expansion.

While that's more than the 1000 S rank kills required for the expansion mount achievements, it would also mean that a player would need to play about 15 hours a day every day to get enough kills to complete the achievement before the next expansion was released if they only killed S ranks on their home world. That's not realistic and so players resort to clogging up world visit and data center travel to also kill S ranks on other worlds, increasing congestion.

Personally I'm a fan of having some achievements that require a long period of time to complete but I think SE has missed the mark in applying that to the expansion level hunt achievements. The counts for the expansion level achievements should be half what they are even with world visit. We still have the Centurio Tiger grind that applies across all expansion kills and that's more appropriate for a long grind achievement.