Well to start with we have 10 pound Redfish eat our shiners while Crappie fishing. That's Ok as I fish with 10# Mr Crappie Camo line on my shiner poles. After a bit the corks & line get contaminated with scum from the water's surface then the line quits slipping. Y'all may do this already but I drill all my corks out with a 1/16 drill bit.

Name: Drilling Out Slip Corks.jpg Views: 470 Size: 39.6 KB

These are Bass Pro Shops Floats but the brand does not matter they all start sticking unless you use smaller line. You can see the float on the left has a much larger hole than the one on the right. Works fantastic.