I don't have extensive experience with baitcasters, but I own and use them on occasion. In my opinion, I think your 8 lb test braided line is too light.
I've always been under the impression that baitcasters are to be used with heavier line such as 12 lb mono and up. This would probably translate into something like 30 lb braid as far as diameter goes.
Line that is too thin will embed into itself when wound onto the spool of a baitcaster. Spinning reels lay the line on the spool, whereas baitcasters crank it on like a winch. My guess is that your thin 8 lb braid might be embedding into itself and preventing the line from coming off the spool smoothly.
Try doing a web search for the recommended lb test braid to be used on a baitcaster. Here is some discussion on a fishing forum:
Bass Resource 
