@t2k: thanks for the detailed feedback! Some thoughts of mine on the matter:
masthead: this very much boils down to schools of thought. It's a bit like with making the logo the link to the startpage (which is a good suggestion btw.). People know that they have to scroll. On the other hand if we reduce the height of the video (it's a video btw.... but don't tell anybody) it will look very awkward.
Centering text makes it really really hard to read and only works well for short snippets
It's only used on the startpage for what basically is very short snippets of text. I had them aligned left at the beginning, but it was looking really awkward.