I have experimented extensively with various domain registrations parameters in correlation to SERPs. In my opinion, private registration does not have any effe

I have experimented extensively with various domain registrations parameters in correlation to SERPs. In my opinion, private registration does not have any effect. The only domain parameter that seems to have effect is the length of domain registration. Your domain is likely to have more trust value if the domain is registered for 5 or more years.