Bot isn't supposed to be major advantage either. Not everyone have access to it so because you "only" deal 49 damage, it's already high enough since decent Bolt/Fireball do that at maxed Level with average Def/Res if not a bit less (just above 40).
Making the cool down from 3 to 4 is making the new bot one use per battle in 1vs1 because against 140 health strength blood mages the match only lasts 3 or 4 turns as well with the Hunter classes especially if the Hunter class does the unblockable massacre.
No no no. You read it wrong. It's useable every 4 turns, not once per battle. Only because Str builds kill fast doesn't mean it's once per battle. That's your view on it. Also Hunters are easier to counter than BMs since they don't have unblockable attack for Strength but Massacre. Set up Reflex/Matrix and you're good to counter it. Not mentioning Bio Bot that may help you or Intimidate. Each class owns one of those, or passive Armor (TLMs/Mercs).
What if the attack is too weak when not used at rage, what will you do then?
It's good enough. Most people always rage Bots and if not, it has same power as other Bots or higher when used later on in the battle. Bots are supposed to be used with higher Focus so you're likely to have good defences and good HP (Focus 4 is best for defence + high HP). So you should survive longer easily. They will be on par, all of them, in terms of damage. Bots are supposed to be advantage for you, not major advantage.
Try one thing at a time first reduce the damage and if it still warrants a longer cool down then next update make the cool down longer, and if it still warrants being made deflectable then the third update make it deflectable but lowering the damage will be enough, don't do all at once.
Thing is, all at once is perfect. Not only it caps at 150% damage over other Bots, it already does 100% after 4th turn, can be deflected but cannot be blocked unlike other Bots/Gamma (50% damage > no damage) and doesn't favour CHs/BHs when it comes to SA. Won't mention that it'll deal that 150% damage all the time since counter doesn't reset so cooldown is good with deflections.