I have seen exactly 2 different magazine articles that have timed 370Z with the 7AT. All the other figures you vaguely quote as being "such large variations" are from the manual car as stated above. The 7AT has achieved the fastest 0-60 and 1/4 mile time I've seen (i'm interested because that is the only one my wife will want). Here is the article.
2009 Nissan 370Z Automatic - Short Take Road Test - Auto Reviews - Car and Driver The same magazine has tested several manuals as well so I assume they have a decent baseline and familiarity with the car. Also as stated above, using the manual shift mode shifts the car as fast as possible so the "adaptive" part is moot. Almost all automatic transmission equiped cars do adaptive learning anyway, so this isn't something the car review industry is unaware of. My 06 350Z certainly does it as well.