this is getting Ridiculous

[Nestama]

How fair is it for them to steal the monster?
How fair is it of you to say "screw them, this is mine alone"?

Because that was how the content was designed. If you miss it, well maybe you'll get it next time OR you'll get the next A rank in another zone. If all A ranks are down for the next few hours, then do a dungeon or two, maybe even a Syrcus Tower/Second Binding Coil or Frontline's. There is more than just Hunts, you know.

B ranks: I inform my party and we attack the second the eighth arrives. We do not shout. B ranks will be back in an hour.
A ranks: I inform my party and wait for the eighth to arrive before shouting (waiting one minute. Sure, that's pretty short, but hey. At least we let the zone know)
Never seen an S rank so haven't made any party rules for that yet (they usually appear when I'm asleep).

All's fair in love and war.