Glaive weapons like the Kestrel go well with this mod because of their knockdown ability when thrown. Works especially well versus MOAs if you can get to them fast enough.
Fist weapons such as the Tekko when equipped with the Seismic Palm stance will also synergize well due to many of the combos ending in knockdowns or opening the enemy to a Finisher
Finishing touch does not increase the 8x damage multiplier when performing standard attacks on unalerted enemies (attacks that are not finishing maneuvers such as slide attacks). The same thing applies to melee riven mods that increase or decrease finisher damage.
The 60% damage increase applies to the total damage dealt by the relevant maneuvers.