Well, I have 150 points in 1h and 119 wpf points to spend, should I spend them in more 1h or is it a waste? does it stop effecting the performance after 150? (its what i've heard)
This all depends entirely on your build and what you're trying to do.
However, the more you increase your WPF, the less it gets increased. You get massively diminished returns.
If you're wearing medium armor, you can get away with 130 wpf easy. If you wear heavy armor, I'd say 150-160 is fine.
So again, it depends solely on what you want to do. Do you want some xbow points, or polearm, or do you plan on running in full plate all day, etc?