I will need to get the actual model to do a meaningful analysis. Can you zip the source CAD file and the Stream Cache file and send it to me via direct message? If the files are too big for a direct message, let me know and I will send you a transfer link to upload the zip.
After taking a look at the model, there IS a collision/overlap between the screw and the surface. More specifically, I don’t think the collision is from the hole and the screw shaft but from the flat part of the screw head being situated flush (touching) the surface.