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This is a very common problem. My solution:

  1. Hairspray. I stopped playing with bed temperature a while ago. Saves you a ton of electricity as well.
  2. Enclosure. The problem is not how hot the bed is but the difference in temperature between different parts in your print. Whatever temperature you set for your bed it won't heat evenly in every corner. Another issue is air movement around it. It doesn't have to be a full enclosure, it's enough to just cover the sides. Easiest thing to do - put your printer in a cardboard box

Hope this helps