Its very possible that the adjusters are not secure and are moving. If my lifters or cam lobes were wearing down I would have metal in my oil which would stick to my magnetic drain plug. Found no evidence of that. I am going to purchase what would've came in the car originally. I have already made an EBAY purchase and pushrods and new rockers . When they come in I will install and pray a lot. I also sent Ken of Oregon cams an email asking about the lifters they sent me and if they have a high failure rate. .