I have also finished reading Facing the Enemy: A History of Anarchist Organisation from Proudhon to May 1968 by Alexandre Skirda. It was okay. This definitely has a strong platformist perspective. I must add that I had trouble comprehending many passages in the text that just didn't make any sense whatsoever. Maybe it's a translation issue? I don't think I would recommend this to newbies.
I thought that it was rambling and that the layout at times made it confusing to follow. I also thought that the author had an annoying tendency to pontificate a bit too much about why anarchist movements after the Russian Revolution botched things up and to that end the author sometimes seems to suggest that had they just followed platformist principals that all would have turned out well.
The parts of the book that I found most insightful were the early chapters having to do with the infiltration of the police provocateurs into early European anarchist groups. Also, the few paragraphs were the author attempts to get behind the facts surrounding the allegations of sexual misconduct made against the French anarchist Sebastien Faure for alleged offenses against young girls that he reportedly did a short stint in prison for, which is kind of a big deal, both for the subject matter and because I know of nothing else written about Faure (certainly not saying I've read everything) that has made more than cursory mention of the allegations.
Yeah I've read most of it years ago in the translations available online, and at the time I did connect with it. Curious to see if that's still the case. It is very much a leninist "what to do" kind of discourse, though for me at least, autonomia as a whole definitely stood for a different species of "militancy" or a transition to a more distributed and informal notion of social struggle.
I think what I got from it then is pretty different from the more highly political levels of Tronti's thinking, which feel pretty opaque and Althusserian to me, and I haven't really bothered with those parts, but I think that is mainly his later work and not this book.
Perhaps you'd find more of what you want in Romano Alquati's work on FIAT, which is based on inquiry in specific factories, but to my knowledge that has only been translated to German and perhaps French.