Knock Aergrind Hand Grinder vs Timemore C2

Much better taste than more expensive electric grinders. My only annoyance is the collection chamber's *extremely* tight seal, making it quite difficult to get the chamber out when you're done grinding.

I recently bought some coffee beans (Congo) from Costco, and it's a medium dark. I just brewed some now, at a course setting using my Timemore C2 and brewed for 13 hours at room temp. It tastes so vile, like burnt and ashy. I drank if after putting it in the fridge for a few hours