I've tried hard as well. My tips would be:
Get some slight distortion, something along the lines of crunch, nothing too heavy. As you're playing full 6string chords you want to be able to hear the changing notes that is played on the G string. If you've got a a lot distortion all you're going to hear is too much fuzz. Delay is just as important as the distortion I think. I wouldn't use reverb and here's why:
You can hear at the beginning of the song when Chris tests his guitar the exact amount of delay needed.
Hope this helps
P.S Just want to say, that the solo in this song with delay sounds unbelievably good :O