One thing I will add here is if you do get the CH grab bag from Michael and you "think" you have a problem with any. Call him right away. Do not wait till you know you have a problem! Be ready to give him your full set up info and everything as he will need that to help figure out if what you think is a problem is really a problem or something else is! He is generally more than happy to help like this and can be more help if issues are brought up while still suspect compared to full blown!