For the average random an isle goblin: [Wed Aug 26 19:46:11 2015] an isle goblin was hit by non-melee for 894 points of damage. [Wed Aug 26 19:46:11 2015] Your faction standing with Goblin has been adjusted by -3. [Wed Aug 26 19:46:11 2015] You receive 7 gold and 1 copper as your split. [Wed Aug 26 19:46:11 2015] You hit an isle goblin for 894 points of damage. [Wed Aug 26 19:46:11 2015] You have slain an isle goblin!
For the 2 an isle goblin near a goblin headmaster and the 2 near an isle goblin chieftan: [Wed Aug 26 19:57:09 2015] an isle goblin was hit by non-melee for 652 points of damage. [Wed Aug 26 19:57:09 2015] Your faction standing with Goblin has been adjusted by -9. [Wed Aug 26 19:57:09 2015] You receive 1 silver and 2 copper as your split. [Wed Aug 26 19:57:09 2015] You hit an isle goblin for 652 points of damage. [Wed Aug 26 19:57:09 2015] You have slain an isle goblin!
Perhaps level plays a part in the faction hit, all were grey to me, just killing time foraging up marr cherries!
The island is real small that they are on...I was lvl 16 and my friend who was lvl 17 decided to hunt these...the small island causes them to swarm you...