[mjannusch]

I've got DR's street cams in my Spyder and don't get that much noise on top.

I was thinking that if you still had stock springs maybe they weren't strong enough to keep the rocker against the cam lobes and were floating a bit which may cause noise. Since you've got upgraded springs that shouldn't be the case.

Over the years I kind of wondered if the 3rd gen lifters with the larger top hole might bleed down easier than the earlier lifters, but I have no data that would support that idea.