Frost dragons breaks at like 1.8?kk xp, no level 150 is going to break that, not even with constant haste, sd and not opening corpses. The spawn is fine.
Nether Spiders is fine as well - you can just run both caves and even some of the nether + corrupted spider area if you are teamhunting.
Ice Golem spawn is also fine, the task is quite quick, but it could be buffed to be a more viable alternative to Titans for midlvls.
Frost drakes idk but werent these buffed just recently? Aligning spawn timers never hurts though I think