Sorry that you’re not getting too many firsthand recommendations. I was following the thread because I hope to get there at some point and wouldn’t mind having a guide to make the logistics easier.
FWIW, I found a great guide in Bariloche by reading reviews on TripAdvisor. What I learned during that trip is that guides in Argentina and Chile are certified and only allowed to work in the specific area and on routes for which they are certified (or licensed maybe, something like that). So if you find a guide with a bunch of good reviews on the internet and they’re certified for the route, it’s likely to go well because they know it like the back of their hand, they know the refugio staff intimately, etc.
I’d also prefer a firsthand recommendation obviously.