It's widely known that 2hander DD's (especially warrior and dark knight, but to a lesser extent dragoon and samurai) are weak right now. There are a lot of reasons why this is the case, but it's not too late to fix this for the last major round of content.

Give the Aeonic 2handed weapons very large amounts of accuracy, and tie them to powerful weaponskills.

Currently 2h WSes lag behind 1h ones like Chant du Cygne (this weaponskill is way too powerful!). There is no reason why this should remain the status quo. And dual 1h weapons have higher stat bonuses compared to 2h plus grip. To balance this, either give 2h weapons higher stats, give grips higher stats, or restore the ratio of attack/accuracy given by STR/DEX for 2h weapons to the old 1:1 ratio.