[BradleyK]

I'd start with the lab. My experiences with Pan F has been nothing short of exceptional quality and I have been dabbling with that film for about...ummm....7 years? If they are thin, sounds like a developer issue. Actually, patchy can be caused too by poor development procedure or spent/incorrectly mixed chemistry.

+1. PanF Plus (PanF) has been in my arsenal for something in the order of thirty years. No issues at all; an exceptional and absolutely beautiful film (my choice for landscape/architecture/fine art shooting). My guess is that the issue is with your lab; why not process it yourself? Results will likely be more consistent...