As for carp, it all comes down to where you catch them and how they fight in different locations. And different locations they do fight differently as I've experienced them. I fish for carp a lot, and the carp here in California rivers like the Sacramento Rivers and are dead on powerful. I've had results of them breaking 25lbs test. Normally that's because I don't have enough time to loosen up the drag and carp here run automatically once they are hooked. I use braid line as my main, 30lbs-50lbs test and a minimum of 12lbs test leader of maxima. But then im not relax when I hooked a carp here on 12lbs test, at least a 15lbs test. I've had monsters here that stripped about 100 yards off my spool...biggest I've caught to date was 41" weighing in at 36lbs. I rate them 3rd hardest fighting fish I've ever fought for size comparision compared to other fish. Salmon comes 2nd and the mighty White Sturgeon comes 1st.
I've caught a 25" bass and it fought nothing near compared to a 22" carp here. Maybe its different at your guys location...who knows.