stretching a bike doesn't increase/decrease any level of "danger". With your bike already slammed the hadnling has been changed. You can't lean it over as far without dragging stuff. A stretch will make the bike feel a little more lazy going in and out of turns but you just have to adapt to it. A mild stretch with the right suspension tweeks may be what you're after. It's when someone throws a 12+ stretch and ignores the suspension that can make a blah ride.