I would not recommend you replace of the cork and change to carbon fiber as the CF drag will really wear the aluminum spool. There are things you could do with the cork and spool to improve the drag. You would want the reel designed so that the carbon fiber contacts steel not aluminum. Thats why most of the new mooch designs have gone to CF stacks with ss washers instead of using CF in place of the cork ................... the new islanders for example.