the 4770K was plagued with temperature issues due to inferior TIM that intel used.
In a lot of cases, delidding was the only way to overclock and keep the temps down on that CPU
Those fans aren't as high RPM as the corsair ones, but they go up to 1500rpm, so should be good enough
Double check the temps with hwinfo
Might be worth reseating the cooler with a fresh layer of TIM