Bill,
It could be a number of things. If you want to know for sure if they are too weak, strip the feathers off of one of them and shoot it.
If you're right handed and the nock kicks left and or darts to the right of your target...than it's most likely weak.
You now have a few choices based on your bareshaft test.
#1. shorten the arrow until the bareshaft flies properly.
#2. get new arrows that are stiffer in spine.
#3. use lighter points.
Ray