I agree about the recommendation letter. I wrote all very important
information (publications, research, high impact, citation, industry high
light) in recommendation letters.
As for Eb1-b, the most important things are the letters including "
employment verification letter (permanent research job)","offer letter", "
company's annular report or other documents", "three years research
experience", "company has more than three researchers". If you have those
letters, you should pass Eb1-b easily without RFE.