Thanks for the info, that looks interesting. On the whole I have very few warped records and I don't think I have ever noticed new ones being noticeably warped (like these are).
It's pretty common. As I mentioned before, pressing quality decreases when demand is higher than usual. You can leave them in a stack of heavy books for a few months, that's the old school method. Of course you need large books, it's easier with 7".
Thanks for the info, that looks interesting. On the whole I have very few warped records and I don't think I have ever noticed new ones being noticeably warped (like these are).