Well, tried a UJ85C(Apple) and that soved the ejection problem. However...
With the bezel off the computer, it works just fine. With the bezel installed, the disc doesn't insert far enough for the mechanism to grab it and you have to use something to push it home.
So far in my research, it seems that the only drive that will work well is the DVR-K06. As these seem to suffer from a high failure rate I was hoping to find a replacement and there is a surprising lack of information about this.