I print a skirt before each item to ensure the filament is flowing properly. I'm still pretty new to Simplify3D, but the skirt printing is often (but not always) very thin and wispy. By the time the print starts, it is usually OK, so the print turns out fine.
I'm using MakerGeeks High Performance Raptor PLA (amazing stuff - strong and heat resistant). Only thought is maybe the filament has absorbed moisture? It is summer now, and the humidity is higher, although we normally shut windows and turn on Air Conditioning when it is really hot and humid.
I've attached a factory file, and a photo is below.

Thanks for any suggestions.
John