Power doesn't meen slow if it's done correctly.
Strength, IMO, has very little to do with power. A little wimpy kid can have a powerful kick. But a powerful kick does not work 100% of the time. A fast one does, if you use it right.
Not as in "I can throw more per second" but rather, "I can throw a good one in the blink of an eye." You don't need it to be a "killing" kick. Just throw 'em fast with as little telegraphing as possible and mix em' up with some other stuff. Burry them in a combo, what ever. Sooner or latter, your oponant will start to flinch every time it looks like you're going to kick. Viala! an opening you can trick them into giving you any time you want it.