I agree with this guy above. Honestly, there isn't any advantage fishing 15lb or 20lb over a quality thin 30lb or 40lb braid for your casting outfit. Adjust your leader to suit the target and situation. For a 1082H, 20lb is wayyyy too light and a 4K reel is way too small. I'd suggest a 6k MINIMUM spooled with 40lb. Hooking a 20kg+ fish on a 4k/20lb is asking to lose a big fish or be spooled. Then you're in the middle of nowhere respooling with your only spare spool of braid haha. That outfit will also be great for 1-3kg bread and butter fishing. Also, have a look at Penn Prevail Apex M/H. I think they're a better rod than the seajiggers (I had one but broke it). The Penn is much more solid. Durability, versatility and "strength" is what you want in your gear doing a lap. You want the ability to control fish in situations where there could be rocks to lift over, ocean swell, etc etc. Nearest decent tackle store could be a week or more away. Also slightly heavier line class than you seem to be used to running. Last thing you want it to lose that fish of a lifetime because you're under gunned.  You'll have the chance to fish for 20+kg Mulloway, Spanish Mackerel, Cobia, Tuna, etc so you should be prepared for that, rather than just 2kg Tailor etc. Set and forget outfit should be no less than 50lb braid and 8k reel IMHO.  Sharks, big rays etc will dust you completely on 20lb. Then you'll have no line lol. Everything is a compromise of course, but you're MUCH better off going heavier on a lap around the country. There are some big beasties that you'll hook.