Now I understand what you mean and i agree that Robb will provide a wonderful toolset if you wish to dictate the flow of battle. Robb will certainly outperform many generals (perhaps along with Brandyn Tully - Outrider commander) on a 6x4' table. I think that emphasizes Ned's weaknesses in your games. We play on a 4x4' exclusively, and after a while i began to think that the "cramped" feeling of a 50pts game on a table is intentional (is it?). It's an additional challenge to pierce the flanks, but with 2-3 NCUs on each side, things can explode very fast. It's such different game from the cat and mouse 30pts ones.
When i put Ned at the wheel, i make him my army's Vanguard. I keep this in mind when i place terrain, and when i place objectives (depending on the scenario). Basically, it's Ned's game. That's also extra work compared to Robb, but that's also what i like from him i guess. Perhaps i got lucky in the games i got with him though, but if there is an objective that the enemy needs to get, they can't avoid him forever. I flanked him with Stark Outriders and Berserkers, to get those tactic cards to use.
All this said, back to your topic and sorry for dragging off.
How about Brandyn Tully, the Blackfish inside a Tully Sworn Shield unit?
He does provide the desirable morale bonus from the other Stark attachments, so his unit costs 7pts instead of 9 (with Maege for example). His tactic cards certainly promote defensive work to "bunker up" on an objective.