IF bow damage will be upgraded, bow stalkers will benefit from it too.
Melee stalkers need both a dagger and a sword, double attack only works with daggers which is nice for certain purposes.
Gunslinger's damage is already terrifying, yet their health could use some compensation, yet keep in mind, gunslingers are basically just a 1st class with monsterous damage (it would certainly beat any other normal 1st class with the exception of perhaps exceptional TK rankers).
More classes could use a health boost more than a damage boost, the problem most of the time is survivability and not the damage, they trade (although nerfed) utility.
Keep in mind RO is based on stats for max. level 99, this is far above it, skills, modifiers and such didn't get the same change as the stats/leve cap did.
Cards are the easiest way to balance it and I personally have an idea to do so, it would just need some discussing with my superiors and of course some decent testing to make it balance the gameplay.
Any other questions or suggestions are welcome.