On my ENO DN, I have done a variation of the Knotty mod or "side stretch mod". When I am in the hammock and I tighten down the shock cord it really makes a difference.
I added an adjustable structural ridge line but I haven't played with it enough to really see the difference.
As for the suspension, everything is stock at the moment but those carabiners have to go. I am either going to replace them with some ultralight climbing grade biners from REI or go with whoopie slings. I haven't decided yet.
BUT my biggest "mod" will be in June when I purchase an AHE New River underquilt. Its my first underquilt and I am very excited. So long pad wrasslin!