Congrats on lv 80
I would recommend 80 heuksal 80 fire, 70 pacheon, 70 light for this cap. However, you should plan ahead, for the 90 cap, and the new skills. Hopefully, within a year or two, we will have them. If that happens, the build will not be so good as it is at this cap. What happens, is, that a dual can go
90/70/70/70, but they will be facing very strong Blade, spear, sword and even Bow 90/90/90 builds. Consider this when making your choice.