This mech didn't need a buff
That's all that needs to be said. Oh, it's a little frail? Well that's what made it balanced. This thing is a DPS monster. Using it isn't risky anymore. You made a mech that already has DPS that competes with high energy mechs and the ability to heal itself have the HP of a tank? Just what are you thinking? Every time you use the word "balance" it's ridiculous because you always "balance" it for p2p. But what happens when you introduce a new mech but not enough people are buying because this stuff you've already introduced is way overpowerd? You don't nerf a thing and all you ever do is buff. This game is going to be a power-crept hellscape in less than a year's time where progress path mechs are obsolete.
Then again this was maybe the plan all along. This game was already on the path of war robots. Except they decided the step of adding pilots would come before they killed off the old way of obtaining items and introduced a new, (probably) grindier and much more premium way of obtaining the new items, and making the old items obsolete.