Or maybe something you've discovered. I'll start:

I see everyone posting about duel server or ultimate fight this or that. Or doing more damage with Aurora on guild bosses. I'd like to let people know I figured something else out a little better. My team has none of those 1v1 fighters. I use Mikaela, Dark Knight, and Crimson Lord to nuke pve stage content. Now my server is a little newer (55) but Ive cleared all the way to chapter 32. Now see, I'm only the second person on my server who's done that, the other being number 1. I think this has advantages of allowing you to use your stamina more efficiently by giving you better stages to farm as opposed to those who focus on the afore mentioned heroes. My recommendation would be to focus on the same heroes I have, get as far as you can, THEN convert them over once you can't go any further. This could potentially give you a lead on others.