Usually people will tell you to angle the nose up on a Brooks, not down, because that will make the slippery surface keep your sitbones sliding onto the back where they're supposed to be.
This is how mine are angled and I've got no pain issues. The Swallow on my Sputnik is only a couple months old and feels great.
The Swift on my Aurora, over a year old, (I ride over 100 miles/week for break-in reference) seems to have a lot of angle, but it's suprisingly comfy like that.