I'm guessing you play on a low-medium pop realm if you actually had time to form a group to kill him after he spawned.I know hes usually dead 1 min on my realm. Usually 3-4 raid groups camping him hourss before his suspected spawn time.
I think I have the same problem, there's normally a raid group or two camped on halfhill with a look out ready to charge in to kill him.and currently I'm on a pvp server with more horde than ally so any ally trying will get killed.we need to form 2-3 40main pvp raids to defend the Galleon raid.
I am on the US-Perenolde server. Have been seeing a few DSLR-Silvermoon members in Goldshire, thinking we may be linked. Be an honor to run with some of the DSLR members in a random.
BTW for Galleon while xrealming the fight is possible the loot is not, and there isn't any telling as to which server will get the loot.