I've been testing a CBO campaign with a 180-day website visitor custom audience as a suggested spec, then stacked all my top-of-funnel to bottom-of-funnel creatives in one ad set after the Andromeda update. Despite a decent daily budget and CPA target, it barely spends a tenth of it - even with strong CTRs. My suspicion is the custom audience is too small, under a thousand people. The system probably sees it as a constraint rather than a signal.
Markets evolve, but the fundamental tension remains: do you hand over full control to Meta's algorithm or keep a human layer of segmentation? Right now, I'm leaning towards ripping out the audience and letting the platform breathe. Anyone else seeing similar throttling after the update?
