Intrinsic question (I tried and tried.. but I'm not smart :-) )

before I bother people I try and but cannot adjust one thing.

I follow the video of Will, I also read "a complete grid…) but I can’t figure out…
If you open this page let’s say in large screen everything (so far) looking good, then when you start reducing the wide… let’s say on a w.1100px is getting a lot of space as image below. I wonder if there is a way to get the gap closer…
people that knows and use Intrinsic know what I’m talking about.

here the link:

Tagging @willwood