I've done just the opposite with my son. His stride length was around 55 inches at 5-10. We've now lengthened his stride to around 70 inches, and it seems to have helped. He actually is throwing harder by getting his hips moving to the plate (his entire delivery is much more explosive) and he is able to the keep the ball low much more than before. I should also add that we've changed his delivery to low 3/4 too.
Simple math tells me that 83 mph from a 55 inch stride is easier to hit than 83 from a 70 inch stride. It is all about getting closer to the plate. He is 16 yo and we hope to get his stride out to around 75 inches over the next year. This would be in excess of 100% of his height.