I am not sure it's really the offensive line. I think so far it's been playcalling (which may be a product of the offensive line), Burrow, Mixon and Chase. If you dig deeper into the numbers that seems to be the case.
Burrow and Chase are obvious issues (injury and youth) that should be rectified simply with time. Mixon should also break one or two. I am less worried believing they are the issue than the OL