I have no exact numbers but I think the health buff on higher difficulties that was made to compensate for lower bot counts has been too high (at least on Hard) I was only a couple of days into my game and encountered TigerBots with 2000 and BlunderBots with 800 shields. Even with my best weapon I would have to hit the Tigers something like 6 times. The BlunderBots took 4-5 shots from my mid-tier weapons (like las rifles).
I think that is too much, especially that early in the game.
Maybe reduce the buff to 2x or 3x on Hard?