I've read the book and tried to follow what it describes. The thing is that if I did my form was even worse. For instance; if i point out my toes more my knees buckle in at a lot less weight. If I look down I lose my back and have even a harder time with the depth. So I tried to experiment with a way that would work for me (while reading up on a lot of other articles from experienced people).
I feel though like some points are valid. Haven't given the thumbs and wrists any thought.
The depth is something I always try to improve. Question is if I go deep enough now to proceed.
Thanks for the replies!