There is no way that CG can cause a roll instability unless its tail heavy and the snappiness that results is a more a function of pitch instability then anything else. Suggesting the default of " set it up nose heavy " really is not correct. The CG should be placed just forward of the nuetral position. On an Extra platform that would be right at 30%. This is an Extra 300S we are talkings about, the low wing version. Much like the one in my profe only smaller. Been flying Extras in IMAC for 15 years. There is no reason why they cant be set up to fly as.easy
easily as a Super Sportster.