No FB ad conversions - switch to diff objective (max clicks)?
first post so please take it easy on me

We've been running ads for a few months now, mostly Facebook for now. We are getting conversions but most all come from exit intent signups that I have implemented - only very few if any directly convert on the landing page (email opt in).
Aside from obviously needing to fix that very issue, I was wondering if Facebook makes a distinction based on the goal I select as to how much I pay for the ad, how it distributes the ad and how it actually optimizes it in their ad network (when it is shown to whom). So since we haven't been getting many conversion, I was contemplating switching to 'optimize for clicks'. Does that make sense at all or just leave it as is?
thanks guys,
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