nock right are stiff. carbons can be very touchy to get spined correctly for each bow set-up, so be patient. Usually, a 4560 shaft will actually spine at the top end, so 60#. This is probably ok as long as your point weight goes up quite a bit. probably around 150 or 190 would perform better. you really want those bare shafts to fly with no left/right wobble before adding fletching. You may have to start with your desired point weight and a longer shaft, if it is still right, then go to a heavier point. If they are weak, then you can cut them an inch and try again, and so on. remember, shorter is stiffer, and a heavier point will make the spine seem softer. pay close attention that the arrow is not kicking one way, then quickly the other. good luck....I got sick of carbons and went back to wood, soooo much easier.