To me it sounds like you know what you need to do, but are maybe a little reticent to do so.
The thing that keeps me interested in this, and it is THE most important thing, is making this kind of a decision. I mean we all have our rankings, but then again player distribution in each league affects rankings too. If people won't trade you what you need, you have to up the ante until the will. Even if that means overpaying. Its hard to believe that ocab is the best you can do. That said, everyone seems to assume in these questions that psotions and guys are evenly distributed, and they aren't. If there is one thing I learned in this game, sometimes you just have to pull the trigger. If it works out, your comeptition will probably say you were "lucky," but you know the truth, you sized up the market first and did what needed to be done.