Hi Dave,
Never seen the bikes at Road Atlanta in person but caught them countless times on TV. However, do you remember John Higgins, that wild-man, Irish ex-pat that used to come into Hap's? He raced & tested at RA several times on his GSXR-750 during his WERA Superbike days before heading back home. His opinions echoed yours very closely, Get the exit of the 6 & 7 complex right or you'll get clobbered all the way down the backstraight. Turn twelve had his balls in his throat coming down the hill, flat through there is Edwards or Bostrom territory. You get high-sided there or in turn 1 and its going to hurt big-time.
John