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I have same problem with leveling system in case of my main character and also with companions. Roguery, Medicine, Tactics, Athletics and Engineering - progression is too slow.
Engineering - its weird. I would like to have a companion for governor position, then i have to put him to be a engineer of my company. He learn how to be good in engineering through operating with siege engines. It is weird. XP in engineering from post of governor is too low. He should be improve, even in proces of building in settlement, not only in finishing. It should be oportunities to learn how to build in others settlement, if a construction is underway, while waiting to heal wounded soldiers.
Medicine, it should be oportunities to heal somebody else, like other lord (quest), heal their wounded soldiers and people in settlements.
Athletics, some extra xp from walking through rivers, or climbing to hill, or ladder, from succesfully kicking oponents, bashing with shield, I don't know, just something!
Tactics - you should be get some xp from waiting in ambush in hideouts, or in case of helping other parties and conversely. In advantage or in disadvantage in battle - not just because of the superiority one side, but if some party have better troops, or have advantige in terrain (perks, culture advantage). You learn how to be good tactician through victories and also defeats - if you survive. Tactics should by also directly proportional to profit of renown from battles.
Rougery - it is good that we are improving in implemented prison break feature. It will be nice see more similar quests. It would be good to get a chance try bribe some enemies to join my side before battle (not just byuing xp, but only in case, when it is really matters, cases of 50-50).
Just something!
I apologize for my level of English. Also slow progression.