You have read all of the ones I have read. Since I've only read a half-dozen or so. BUT I'm so stealing this list so I can tick things off it, I love ticking things off lists, it's how I got through Classic Who and ... a frightening amount of Big Finish audios. >>;

That being said, I have heard Scarlet Empress is good, and I started it at some point but wandered off because I'd never read any of the other ones / heard things with Irish. And it's Paul Magrs. And it has Iris.