This is a lot of over-reaction.

Looking at the other two level 2 brutes, you have:

Zombie: +6 vs AC, 2d6+2 damage (average damage 9)
Guard Drake: +6 vs AC, 1d10+3, 1d10+9 near any ally (average damage 8.5-14.5

Kruthik Young: +5 vs AC, 1d8+2 (average damage 6)

Other level 4 brutes:

Orc Berserker: +8 vs AC 1d12+5 (11.5 damage, plus high crit)
Human Berserker: +7 vs AC 1d12+4 (10.5)
Magma Claw: +7 vs AC 1d6+4 + 1d6 fire (10 damage)

Kruthik Adult: +8 vs AC, 1d10+3; 8.5 average

The Kruthiks, as brutes, do damage that is not in line with other brutes of equivalent level. The -real- threat in a Kruthik encounter comes from the Hive Lord, which is a level 6 leader. Yes, they'll make the Adults do 16.5 average damage, but the young will be doing damage in line with the brutes of that level. Hell, the guard drake is more threatening than the Kruthik Hiveminded menace, and is far less fragile

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