Those Korum quickstops are, I think, designed with the match man in mind so that they can change or re-bait at speed. Most of the time when carp fishing you are not against the clock
In the case of 8lb line not being up to the job - that depends on the quality of the line in the first place. As Kev has mentioned, big fish can be landed on low breaking strain line. Infact if you ask a lot of people what line they use in the winter you may find a lot drop down to around 10lb (if safe to do so) to fine down there approch