That's really unfun, when 60% of your abilities will miss against 25lvls.
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I'm pretty sure that they have some friends-multiboxers in battlenet: with 4 moonkins at hyperspawn spots u can get these items very easy in 2-3 days on farming (well, actually all u need it's just loot the bodies).
I tried to farm pings in drustvar with random ppl (not multiboxers): not that fast, but that possible to get all what u need by tagging, but unfortunately, i can't get items what i need there.
I also find multiboxer in nazmir, where i can get ALL what i need, but for some reasons, their mobs was grey for me so it was a pain trying to tag atleat one 25lvl mob with 8+ moonkins in one place... But still faster than doing it alone as 20lvl. Much faster.
PS i wish these ilvl28 greens will be nerfed somehow, just bcs i'm so tired of this farm alone