[AutotelicBrown]

Originally Posted by m3t4kn1ght

I've tried lifting my hands above the keyboard, which greatly improves my accuracy and speed, however I keep missing keys or double hitting them. which usually ends me up with an even worse score.

When you lift your hands you have to use muscles you weren't using before so it's normal to have some issues at first. You should be fine if you keep your forearms and hands parallel to the ground at a height in which your fingers reach the keys from their neutral slightly curved position.

Another thing you should try to work with is chair height regardless of your chosen posture.