He's spawned 48 hours after his last kill once. So Not every 3 days.
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Try joining some more shells especially ones used to help find members for end game content. I've seen Behemoth and Odin a few extra times now because of someone sharing in the LS when they are up.
got silver for killing behemoth on cactuar on friday.
no pictures. got him down to below 5% and then i got stunned....and then surrounded by AOEs (died before meteor)
The most common suggestion is to turn off nameplates which count as an entity and can result in culling less than ideal objects on the screen. I've also heard about turning off or limiting the number of effects (spell effects, weapon skill effects, etc) to improve what's drawn.
After disabling nameplates on all but my party and enemies I had a much easier time spotting and keeping Odin on the screen. Same with Svara (is that how you spell the dragon's name?). The only problem is whether you feel like keeping them permanently off or taking the time to configure it each time you try to join the fate.