In my 35+ years of engine building. I have not found a better ring manufacturer than Hastings. Their engineers are some of the best and If you have a problem they are not too "important" to talk directly to you, the customer. They will make up special sets ( within reason) and really try to work with you. Most moly problems are from the hone pattern and installation of the ring. Not the material itself. All ring companies experience this but it is usually out of their power, if exact techniques are not followed..