Quote Originally Posted by Urthdigger View Post
It may likely be that forming a party effectively increases your item's level or decreases the mob's level for the calculations, similarly to how forming a party causes more mobs to link in open world content. My guess is that the party is nudging you out of the sweet spot where you get tons of xp.

On a related note, with all this research going on about SB rates, has anyone found a concrete value for how much +spiritbind from potion and gear help?
0.3% increase per "Spiritbond Gain +1"