Are the following damage calculations correct for a L17 Monk/3 Ranger (20 Dex) with Dueling, Horde Breaker, and wielding a monk weapon:
- Standard attack: 3d10 + 4 (from dueling) + 15 (Dex mod) + [to another target: 1d10 + 2 + 5]
- With FoB: 4d10 + 4 + 20 + [2nd target: 1d10 + 7]
- With FoB and Hunter's Mark: 4d10 + 4d6 + 4 + 20 [2nd target: 1d10 + 7]
If so, are Dueling/Horde Breaker/Hunter's Mark the best ways to improve Monk damage (assuming no more than 3 levels taken outside of Monk)? If not, how can DPR be increased?