If you want to role play and try weird build, go for Classic or explorer.
Tactician if you want the game to at least try and provide some challenges. The game do give enemies some special aura, I think. Someone on classic will have to provide me with info if the evasive aura, terrify aura and so on are present on Classic or not.
Anyway, even with boosted stat, a properly geared and min/maxed char with no handicap will still deal way much more damage than they do while having too much armor than they can break. Only bosses and "Framed healthbar" units will really hurt you.
