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IMO the investigator is not different enough from a rogue, and needs something new and unique.
And when I imagine one, I think of the Sherlock movie. Where Sherlock would spend time planning his attacks, before making a move. Thus I imagine a mechanic that does similar. Where you spend actions/turns thinking and building up a bonus, before a big hit. Something like...
Investigate Attack: 1 action.
You imagine yourself making an attack against a creature, making sure you will succeed before committing to it. Make an attack roll using Int and your weapon proficiency. You do not need to be in weapon range, and do not actually attack, as this is just in your mind. The bonus from Investigate Attack is cumulative with other uses of Investigate Attack, up to a maximum of your Int modifier. Allowing you to keep refining your plan until it is perfect.
Critical Success: When you make your next strike against the target before the end of your turn, do not roll a d20. It is automatically a critical success. If you do not strike this turn, you gain a +3 circumstance bonus to your next strike against the target within the next hour.
Success: You gain a +2 circumstance bonus.
Failure: +1 bonus.
If you use this against a creature who is not actively fighting, and are relying on secondary clues such as their stance and wear patterns on their armor, you outcome is a degree worse.
I also imagine something similar for out of combat. Where you can "gather clues" towards your case, until you have enough for a "big reveal".