The most important lesson here, I think, is the re-affirmation of the age-old rule that a too short surface interval is a pact with the devil.
I only ever had one samba outside of competitive/deep line diving, and it was due to a too short surface interval (about 1'30"), with an aggressive breathe-up during that interval. No amount of aggressive breathing will speed your recovery from a dive. Time is the only important factor.
Now, a 1'30" interval may fine (or even excessive), from a 20 second dive to 20 feet, but after a harder, deeper dive, a 1'30" interval is way too short. Generally it takes around 4 minutes to recover from a deeper dive, and starting the next dive earlier than that means you're starting 'on empty.'
Eric Fattah
BC, Canada
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