In most cases 'Tactician' means, that enemies just get a 50% boost on EVERYTHING. It's an issue some of us had from the beginning, even more because of how the armor system works. Most fights turn in a pretty tedious armor grind. Even worse this is at a not that well balanced 'early game'. The player is heavily disadvantaged there, because enemies all seem to have great 'gear', while player has neither gear nor skills, even more if he does not know his way around.
This game also heavily depends on your level, going into a fight with one level more makes quite an heavily influence on the outcome so you should hardly ever enter a fight with being lower level.
