Putting a new cam in my 360

I know you are past this all but this statement in the 1st post caugth my eye: "Lifters were 'new' but had been sitting for a while." Not sure what this means but possibly sounds like part of the problem.

FWIW: Here is another vote of preference for Lunati. Even moreso for Crane; I feel their overall experience shows in profiles that are easier on engine parts and the lobe/lifter contact pressures.
It was definitely a concern for me that the lifters I got with the cam had clearly been on the shelf for a while. I lubricated them as carefully as I could, but I never popped them open to look for corrosion/etc. Now that I think I've figured out the source of the issue, I'm less worried about the lifters.

I'm looking at the Lunati Voodoo 262/268. Little shorter duration than the Comp and a higher LSA and more lift. Little less lumpy I guess, but might be jumpier at low RPM?
I just don't know if I can get one in a hurry (and I am in a bit of a hurry).