I would agree, you can have too much spine. But it's not going to be as detrimental as too little spine. It's probably more critical with aluminum than carbon arrows. I got some PSE Extreme 300s finished and shot today with them. These are over-spined for my bow's draw weight, given a 28" arrow. They fly and group great! I think the spine charts generally don't consider the difference in efficiency achieved by today's bows. A bow shooting 315 fps at 60# is definitely going to stress an arrow more than a 60#er shooting at 285. I decided to try the 300s due to this. The initial finding is, these shoot better than my Redline 410s or 460s, which are OK for my setup (by the chart).

Phil.
"Could you guys be quiet, my dad's trying to shoot."