There’s no room for “magic” between deceleration and acceleration. You should be on the throttle as soon as you’re done braking in nearly every instance of corner. If you’re coasting, you’re slowing down. If you’re slowing down, you have to add wheel input to tighten the turning radius and maintain the same load on the outside tires. If you start losing load on the outside tires, you’re not only not using all the grip and going as fast as you can through the corner, but you’re allowing the inside rear to set down and you’re going to kill your exit speed two-fold.
Also note, in sprint karting, you really only turn the wheel for a very short period of time. Just long enough on turn-in to get the inside rear to jack up. From there you should be straightening the wheel to roll off the corner and allow the lift of the inside rear wheel and the “spring” you’ve loaded in the frame to carry the kart off the corner.