thx Walter for encouraging me to visit the fire opal golems a second time. when i arrived, there were 4+ present, andi had a constant and sufficient respawn (3-5 spawning each time). so much for good news.
i then visited the emerald golems on saritova again (here my amateur observations, perhaps they are useful):
there used to be 4 linked spawn places for emerald golems (26951/14915, 27206/15284, 27845/15644, 28309/15864), and if clearing one or more of them you could be sure to always and immediately meet reincorcements in the linked field. my visit today went like this:
west field: verdeios there, couldnt kill him, wait 3 mins, 2 em. golems spawn, killed them, waited 15 minutes, no further spawn, left
half west field: no golems present, waited 15 minutes, left
half east field: 1 golem, killed him, waited 8 minutes, 1 golem respawns, killed him, waited 15 minutes, no further respawn, left
east field: 1 golem present, killed him, waited 3 minutes, 2 golems respawn, waited 15 minutes, left
thats 7 golems in 74 minutes!
seems the fields are still somehow linked, and if i had made the way back again i would probably have met (perhaps after waiting 3 minutes) golems again. now having to wait 3 minutes for a spawn to be triggered and working is bad enough, but the trouble is, you never know when one of several linked fields is depleted and all waiting will be in vain. but upon arrival you simply have to wait to find out if anything could spawn there at all. not fun.
i believe the constant spawn of the fire opal golem spot (and on fire volcano island too) is caused by the linked spawn locations there being located side by side (fire opal golems on saritova for example spawn either all near the entry ledge, or near the backside cliff, these might be 2 linked spawn points). so your presence in one field triggers spawn of both fields.
Phade, or anyone at AE responsible for mob spawn, if my observations/guesses are nonsense, please ignore them,but have a look at the 3 threads about spawn problems (not only t5 mobs) in the unity subforum anddo something about the spawn! Thanks.
Varaenion/Unity