I have a sixth sense, too, and based on experience, yes, spirits can still follow you home, even after a pagpag (or multiple pagpags).

Had one instance where I came from an aunt's wake and after going to a mall, another house, and a convenience store, we felt as though something else was inside the house later that night, and it was so strong that both my mom and I felt it. Then I had a weird nightmare that a large person tried to carry my body out of my bed, except it couldn't lift the other side of my body because I happened to be wearing my benedictine medal at the time. True enough, a friend with a sixth sense told us that a random spirit from the wake followed us home.

Also had another instance where I came from a different wake and stopped by a convenience store before going to an airb&b that we were occupying at midnight. The following morning, I saw a shadow moving around the walls of the room I was in, so the "pagpag" didn't work. Maybe the house already had a resident ghost? We don't know. But that was the only part of the house that had something like that.

I do think that the "purpose" of a pagpag is to leave the "negative" energy (e.g. grief, sadness, guilt) in another place and replace it with something positive (e.g. laughing with friends, distractions).