Well, I think that 100% number is a little to vaugue. You see guys who can stride 85% of their height and throw 95mph, and guys like lincecum who are closer to 110-115% and throw 95. We are all different, so using a general number is not the right idea.
A better method would be to say drive as far as you can without inhibiting your hip rotation. A stride should be as sideways and as laterally based as possible, because that means you are keeping your hips and shoulder closed by doing so. But sometimes, in an effort to extend their stride, a pitcher will open up their hips early, which leads to an early torso rotation. You could have a 120% stride doing this, but it will be for naught because striding this way is massively inefficient and you will find yourself throwing slower because you are flying open and losing lots of potential energy.
So find a stride that is comfortable with you. You can extend a little beyond this comfort zone if you want to, but don’t try and overdo it because do to our inherit flexibility, some of us can drive further than others, and trying to go beyond that will do more harm than good.