hi , i recently purchased a pse x force ss, i called pse and asked what they suggested as far as the correctly spined arrow for my set up my bow is set at 68lb i am using an octane capture rest and my draw lenth is 29". i was told by the customer service rep that the carbon force 300 series would be fine. i bought a dozen carbon force 300 hunters with blazer vanes and a 100gr f-15 broadhead.i am having a problem with the arrows splitting at the knock. iam shooting at a backyard buck from 20 to 30 yd. when i remove the arrows from the target i have noticed that the arrows have a split in the carbon shaft anywhere from 1/4 to 1/2 inch long . iam down to 4 arrows now. i called pse back again last nite and the customer service rep told me that i shouldnt have a problem and they have had no issues with those arrows. she said i can cut the arrow down and still use it. i told her that i threw them away because they could have some damage along the shaft that icant see. she just said o k is there anything else ican help you with. i really dont know what to do now or what arrows ican shoot now . iam very disapointed in the fact that i spent so much money for this bow and now i am afraid to shoot it.