Interesting. I wouldn’t think the Codex character would have too much trouble with a +15 attack if they had good defense and multi-dice rolls.
How many attacks were you giving your pathfinder guy? With MF like Meisterhau you’d be getting 2 dice attacks which also count for defense, I would think the Pathfinder guy would have a hard time getting hits.
Try someone with a shield like the Orebite Knight or the Brother Knight in Monsterberg 2 (but on foot, so no lance or charge bonus). Or try a character based around the Ernstfechten longsword fighter. That would be fun to watch.