How long did you run it? Sometimes it takes several minutes and varying the rpm to get them quiet. Usually the best time to set hydraulic lifters is before they are run. One they get pumped up things get weird. sometimes they are solid, some will bleed down. They don't feel right. That's why I personally don't like to mess with them after initial set up. You have to make sure at set up your preload is correct and don't get tempted by the noise. Sometimes it even takes a couple stop and starts of the engine to quiet them.That being said, you could have something going away here. My comments are my general experience with hydraulic lifters.