Ahhhh, the written word, so easy to misinterpret.
Your first post was correct, but not very clear (neither of you initially mentioned that surface/hole area must remain the same) that's quite important
Your second post was even less clear. The oil starts moving very fast, very quickly, and gets very turbulent (through the small holes), so you then get pack (i think the technical term would be stalling). You must have the initial movement (however small) to get the pack.