I really really dislike the idea of hunts being limited to the group that finds it; think I've heard that that was how it worked in FFXI and there were problems with people camping and locking everyone else out. I also disagree with putting a cap on seals, though I hate it ever so slightly less than the shutout idea.

The idea of the marks leaving clues as to where they are by way of footprints and such I do like! Also a timed immunity, but only for a minute or two tops (perhaps immunity can trigger when a player in the zone gets within a certain distance, not necessarily visible). Hp haven't really been an issue on our server since the adjustment, but (capped at some point) scaling difficulty would be really cool to have. Really agree on an increase in weekly hunt rewards, I usually forget they exist until I see a mark with the symbol above it's head. The people that I think they're intended for (don't have time or will to participate in free-world hunts) don't even bother with them because the rewards are so insignificant.