PDF import DOI detection issues

Just upgraded to EX6 for X4 and pretty happy with it.  I was suprised though that the PDF folder import is still giving us 50% accuracy with many still not importing cleanly.  I reviwed the ones that dont have the meta data import correctly and the vast majority of them clearly have the DOI info clearly contained in the first few pages.  If DOI right there on page 1 why is it getting missed?  Anythign we can do to improve it?  Thanks

Hello - If there are PDFs still be missed where the DOI is there, we’re interested in taking a closer look. I’ll contact you directly to follow up.

 - Mathilda, the EndNote team