I have a 355 with a Lunati bare bones cam with the lifters that came in the kit. Cam makes more power than the Comp XE268 that I had in it prior, but the lifters seem to bleed down while driving. Starting up they sound great, I drive on the highway about 25 miles to work, and when I get there they are fairly loud. Tapping like they're out of adjustment. If I sit and idle for a minute or two, they go back to normal and sound like a sewing machine again. Anyone run into this?