Geebee, while you needed the War head seals from Granite Borer, you were still caught by the congestion on a mob that is part of a KI sequence for a mob that drops Empy weapon upgrades, in this case, Itzpapalotl. Of course it doesn't matter whether you need the seals or the KI, the effect is the same.

So many people now are doing empy weapon trials that the competition is getting unmanageable. We desperately need SE to find a better way or it's back to the bad old days of HNM camp dynamics all over again.

Until SE does something to fix this, if you only need the seals, you might have less frustration by choosing a mob that isn't part of a chain that leads to an Empy weapon item dropping NM. In your case Geebee, you could have considered Kampe instead.

This is not always possible though. In fact, if you have an Abyssea static, you should be looking not only at your armor needs but also your empy weapon needs (even if only for the future) in planning your battles. For example, if your war was going to eventually do the GAxe empy weapon, you'd want to get Granite Borer's KI and do Itzpapalotl yourself. That's the most efficient way to go.