those are good answers and all fit well. Here is something you might like as well to break up the monontiny, and develop some better kickers.
Remember, speed, balance, control, muscle development, flexability, all play a part in the success of a kicker. Try doing slow kicks.
Slow slow slow. count out loud 1, 2, 3, up to 15.
Have them begin in a front stance for a front kick, begin slowly with hip alignment, raising knee up high as they can, extending foot out, lock knee and hold for 3 counts, then begin retracting in the same manner, until you reach 15. Do 3 kicks each leg to start out with, and do the same for side kick, round kick, and even back and hook kicks. I think after a few weeks of this, you will see an improvement.
I hope it helps.
bb