Check out some of the Martial Feat archetype packages starting on page 45 in the core rules. These represent 6th 7th maybe 8th level characters (with a martial bent). The combination of their feats work together to make them really dangerous.
If you have monsterberg 2 in particular there’s another 10 characters that are somewhat “optimized”, which can maybe give you ideas.
Did you have a sense of what was causing some of your fights to go slowly or end up in stalemate?
