Update:
After talking with several different companies, including Accutune, I am going to send back the rear 2.0s to be revalved. Accutune has been great answering my questions and are willing to revalve the 2.0 for free (I pay shipping). If that doesn't work out, I will look again at the 2.5, but they are hopeful that by reducing he high-speed compression, I will be close to what I want. They also repeatedly told me that I was much pickier than their average customer... prob true, but that's why I don't drive a 4Runner.