Probably not much help but I would look for some old NOS Mopar or old stock TRW or Crower lifters from way back instead of dealing with some of this crap that is currently made. Maybe check ebay. I have a set waiting for me when I do my cam swap. A few years ago I ordered a MP cam and the lifters were chipped along the edges on the bottom of the lifters. I sent it back.
Luckily so far I never had a issue with bad lifters. Honestly it sounds like you just got hold of some crap lifters if the oiling is good to the rockers. How do the ticking/tapping lifters feel in the bores (tight or loose?)Was it tapping before the cam change?
