Weeebbz...
My best guess is that its the AILERON_EFFECTIVENESS and ROLL_STABILITY scalars. I changed AILERON from 1.8 to 1.6 and then changed ROLL to 1.6 because people were saying that the Hornet rolled too quickly and was too abrupt, others here agreed, so I lessened it. To get it back, open the AIRCRAFT.CFG with notepad and under [flight tuning] section, change AILERON_EFFECTIVENESS = 1.8, and ROLL_STABILITY = 1.5, then see what happens. If its too much, simply change til you get something you like. Such as AILERON at 1.7 and ROLL at 1.6, fly and see if that works for ya.
Later
Sludge