How to avoid the thin and difficult to remove raft/support?

[new3dprintinguser]

Hi, sometimes when the models are print using PETG on my Prusa i3 MK3, there is a very thin layer that is very difficult to remove (see "thin support without raft"). What caused the thin layer and how to avoid having it? Somebody suggested printing a raft of three layers. I did that but when I removed the model, the raft was so sticky that the bottom surface of the model got ripped off and stayed with the raft. What suggestions do you have to prevent that from happening?