Nah, don't do that. It will become a chore of an exercise. Instead, if you want to gain EXP quickly and avoid the grind (and not pay $10 for the booster ) the quickest way is to take down a nation's power (take out their key targets, forts and leaders) and force the conquest battles. Conquest battles give you *MASSIVE* amounts of EXP if you're fighting for the attacking side. Also you get more loot from the attacker's side too.that is exactly what I am trying to do ...actively try to find and fight those guys asap
If you're gaining bounty during game play, let the Mercenaries come to you. By the time I was finishing the story, I was already tier 1 on the Mercenary ranking without needing to specifically hunt them down. The game will naturally send the higher level mercs to you when you start causing issues on higher levels.