The itinerary looks fine to me. In terms of saving travel time your idea of starting the trip in Buenos Aires is a good move but... you'll miss one of the most mesmerizing cities of our planet... Rio de Janeiro.
Ecuador is beautiful too but it's going to be hectic with just 11 weeks. You should definitely spend as much time as you can in Bolivia and Peru. I spent 3 months in Peru and 3 months in Bolivia. Both countries are breathtaking.
Rurrenabaque/Santa Rosa is highly recommended, one of the best places in South America to see an abundance of wildlife.
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