Use the hip pop to drive bigger overhead reps.
Time the leg drive with the press, don't press before the hips fire.
Inverted against the wall, your shoulders press your entire bodyweight, with the triceps finishing the lockout, and the kip lets your legs contribute a burst of drive out of the bottom. That leg drive turns a grinding strict rep into a fast cycle, so you can string together far more overhead volume per set. It earns its place in conditioning workouts where big sets of overhead reps matter more than strict pressing strength.
Yes. The kip adds speed and load to your shoulders and neck at the bottom of the rep, so you want the strength base of at least a few strict reps before you start bouncing out of the hole.
Timing. If your arms start pressing before your hips fire, the leg drive is wasted, and if the kick comes too late the momentum dies. Drill the tuck and extend rhythm with pauses at the bottom until the pop and press land together.
They are a different exercise with a different goal. Strict reps build pure pressing strength, kipping reps buy volume and speed for conditioning, judging one by the rules of the other misses the point.
