TSOF:
I've been in your position. I was at the top of an organization for much longer than I should have because I thought I could do better by changing it from the inside than the outside. I was wrong. It was a gigantic bureaucracy and essentially unchangable. Far more damage can be done to a bad organization from the outside where you can speak your mind and tell the truth. Faking it and hoping that, because of your position, you can change things, won't work. You'll end up with little to show for it and probably more than a few grey hairs. If you haven't read it, check out Ray Franz's Crisis of Conscience. He was at the top of the WT and his attempts at change only got him kicked out.
I'm just relating my own experience from a similar situation. Large organizations have a way of not changing unless forced to do so. They need a crisis on their hands to begin the change process. And I don't mean a little crisis, I mean the organization's very survival. And most large organizations which come to that point do not survive.
Think of the Watchtower as GM. GM has been in decline for 10 years or more and may go bankrupt in the next few years, and it is still having a very hard time changing. The WT is like GM 20 years ago. It has a long ways to go before it enters crisis mode.
A friend of mine who was part of the board of directors of the same organization as me stayed on a little more time just to see some of the little things through, one person at a time. She felt that the overall organizational management was too far gone to change anything, but she did have it in her power to help a few people in individual situations. She decided that was her place, and I respect her for that. I see your situation as something like that.
I don't want to sound like a downer, but you're not going to change the organization. About all you can hope to do, as you have said, is help those individual cases.