For me, Wulff is not the correct choice. He's just too expensive for token generation. You are better off with Tua and some defensive retrofit (blast doors might work well here). Remember you don't get a lot of shots on target, so don't bleed your shields too early.
The thing is you're spending 10 points and your Modification slot for Tua+Redundant Shields and Wulff can provide you 2 Engineering points/turn (to regenerate one shield) most of the time but is also flexible enough to use other tokens again as necessary for 7 points so I don't find your "too expensive" argument very convincing.
I also said in the same sentence that Blast Doors might actually be a better choice than redundant shields. The more I think about it, the more I think Tua+Blast Doors would work better.
I said Wulff is expensive for Token Generation, that if you ever need him to regenerate a different type of token than engineering, you've effectively lost that one shield repair that round. Redundant Shields is pricey, but removes some of that planning headache.
RBD+Tua is still 7 points, the same cost for Wulff, and if you use Wulff only for Engineering every turn, he's just as effective at preventing damage by turn 4 and turns 5 and 6 (if you get them) are gravy.
I find the argument that Wulff is somehow worse (even though he's cheaper or equivalent cost to other options) because he's so good at providing other tokens you might want to use those instead of Engineering on a given turn to be quite silly. I mean if my officer can do something more useful for the ship he's on than just force me to regain a shield every turn or once a game remove 3 facedown damage, isn't that a win?