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I believe the secondary mods are: 30% DEX, 40% CHR... STR caps pretty easily on daggers due to their lower base DMG compared to two handers, but it never hurts to have a handful in there. The nice thing though is DEX doesn't cap, and along with adding slight base dmg to the calculation it slightly enhances accuracy as well. CHR is too insignificant to worry about adding it intentionally over acc, atk, str or dex but if there's nothing else CHR is good. However, you really should only go mod heavy on DE if you're very confident you'll land all 5 hits on whatever you're fighting. If there's any doubt, then accuracy is a must.

Ninja edit: My bad, turns out CHR does have a 10% higher mod difference but read my above statement why DEX is better overall.