Here's the thing: Optimizing for conversions on day 1 mean that you forcing Facebook to find the exact audience that will complete a form or make a phone call on day 1. While that is possible, it tends to get very expensive.
When starting a new Facebook Lead generation campaign, start thinking about training Facebook's pixel to learn about your target audience.
Instead, optimize for landing page views for 1-2 weeks or 5 or more conversions.
In that time, the your new pixel is seasoned and now it knows the type of audience that would click through and ultimately convert.
Need help setting this up? Send me a message or visit us at http://svlmarketing.com