Oh, yes, I forgot about Ishmael. Totally seconding that rec. A time-travel amnesia crossover with Spock in the center. Loved that one. And I also liked Duane's Vulcan novels. And iirc she also wrote some about the Romulans, also quite good.

I may be the only one who didn't at all enjoy the two Phoenix tie-ins. Back then I had no idea what slash or h/c was, and okay, I've always been a genficcer at heart but I've also always loved h/c... except they are done so unsubtly that it took over the story imho.