Currently I have a standard Melitta Filter and a standard water kettle. I have read and heard that the pouring speed makes a big difference for the result but I can't really control that very well with the spout of said kettle.

Currently the coffee tastes like a mix of under- and overextracted which is really confusing. I have tried different grind settings before but the issue persists.

Edit: The mix in over- and underextracted might also come from me not stirring before drinking the coffee.

Is there a way to improve this without getting a new kettle? What other things can I try?

Edit: I have now tried pouring with a Pyrex type measuring cup and it pours much better than the water kettle. Combined with stirring afterwards it noticeably improved the taste. The grinder I use is the Timemore C3 ESP pro.

Thanks everyone!