I think walls can add quite a bit of weight to your base (not sure about the Uni boosts to walls)
We used to have a member who ranked #1 at one point and his army and defenses were not all that. His walls shoved him right up. He had to attack down 4 or 5 places in the lineup for is to be using attacks wisely and stronger attacks in the right place.
But like the others said ignore the XP number is quite misleading as it could either be made up of all Farms and Road networks and not much else, or visa versa all attack/defence and no farms roads etcs...
You'll also find two exact same players with the same XP, one with Versailles, Acropolypse, Angry Twat etc.... will be higher than another exactly the same with Stone Henge, Taj Mahal, Notredame (for example... cant remember which ones are the same age or not... lol) but you should get the drift.
Mus
British Lions!
British Lions!!