You should consider these major two factors when shopping for a home loan regarding APR
1.) What is my interest rate?
2.) What are my lender fees?
My company has a policy to offer par pricing (which happens to be currently 4.250% for your scenario) and a flat fee for lender charges. We charge $1,590.00 which are etched in stone. That's how you should be looking at it. APR is a little misleading, as we have to list fees on our GFE and Truth in Lending that we really don't know for sure until close to the end. So APR can vary. You should shop rate and lender's fee on not APR.
Just a thought
Just my opinion