my car was doing the same and after a litle research I got the car to feel the same all the time, everytime I step on the throttle now the response is instantinious even better than stock
I put new Denso iridium plugs and coils,
IATS relocation kit
SPAL electric fan conversion
the fan conversion made a big difference power wise especially when the motor is hot, also the IATS is responsible for making the car feel quick all the time due to timing advance regarding of the temperature