Just because you intend to use a longer & heavier action rod is no reason to use line that is two times the pound test of the line you were using on the shorter rod.

Learn to play the fish, learn to flip the anti-reverse switch off and back-wind your reel handle to keep pressure on a hard pulling fish while not letting slack in the line, or set your reel's drag to slip at less than the breaking point of the pound test of the line you're using.

Personally speaking, I prefer the "back winding" method, since I have successfully caught & landed several species of fish that were much heavier than the pound test of the line I was using ... such as a 6lb Largemouth, a 8lb Hybrid Striper, & a 12lb Tiger Muskie on 4lb test (Stren Gold).

I used to use many different brands of 4lb test mono line, but in the last couple of years I've been using 6lb test Vicious copolymer line ... and my casting distances, hookset strength, number of bites, etc. has not changed. The biggest difference that I've noticed has been fewer numbers of times I've broken the line while trying to pull a snagged lure free.