perry thinks you cant get two chronos to give the same reading so go figure
however i have never seen the right spine come out of archers advantage but as i say i guess that is because people use the program wrong. This is a good example of someone quoting a figure that must be right cos it came out of a computer. If a 27.5 inch arrow out of 55lbs was too whippy at 400spine then what would we all be shooting (use a little common sense)
Again let me say i thin archers advantage is a great program, well researched and produced but it has given the wrong answer here, probably due to user error