A massively.com write up on why hunts are ruining this game

[Altena]

Remove sand as a possible reward from hunts.
Replace the oil in ST with sand.

Limits you to 1 sand per week, but still allows you to faceroll your accessories if you really wish.

The other suggestion of only giving full credit for the first kill - as a weekly bonus would solve a lot of additional issues.
This would effectively be a soft cap of 1275 seals per week (provided you hit every mob including every S).

The part that is broken about it is that it's an infinite supply in its current state. You can faceroll your keyboard for as long as you are awake and get unlimited seals.
There is "catching players up" and there is "broken".
Hunts are most certainly broken.

Finally another alternative which is probably not mentioned - award some degree of Allied Seals to Frontlines.
If anything - you could cap the amount you can earn through hunts with the "one kill per week" suggestion, then move on to PvP for 20/10/5 seals (for campaign 1st/2nd/3rd)..