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Facebook Conversions – With specific CPC as goal?

Is possible to optimize for that?

I see that a specific range of CPC give me the best results. I use the “cpc goal” to scale sneak attack. If i can keep the cpc within a certain range i get optimum spend and roas. However, I’m constantly juggling between low CPC (which make me raise bid because I am missing out on sales) and high CPC (which makes me lower bid because the ROAS drops.)

The optimum would be some kind of rules that would try to keep the CPC within a certain range.