With regards to the 09 losing power I think it's fuel starvation. There have been reports that if close to 1/4 tank and high speed cornering that it can be fuel starved as the fuel pick up isn't able to accomadate.
As for high rpm acceleration I think you are just used to the TT you have now. The feeling of acceleration does go away in the higher rpms but if you look down at the speedo you are still accleration at a good pace.
Not sure about the rear squat. I too am used to that with my Z31 and my 370z doesn't have that. I used to have a 2009 touring sport and the rear squat is what I would consider normal, not like the 280zx or 300zx. Currently I have a Nismo 370z and it doesn't squat at all, but then again the suspension is much firmer.
As for the 09 adj suspension skipping around, thats common when changing the suspension to aftermarket. You have to be carefull you chose a set up that is meant for the car. Previous owner may have just not set the struts up right.
clutch on the 40th may need repalcing. Perhaps sign of prior abuse from owner or new manual driver learning on the car.
Based off your description of both cars I would pass and find a different selection. I would avoid the 40th because of the clutch and avoid the 2009 due to the suspension. If I buy a used sports car I want something that was babied and never modified, but thats me and probably why I just buy new instead (aside from my 280z and 300zx).
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