Mindless?
No way. altough several stormtroopers come from cloning cells, most of them are normal men recruited (at times by force) from the Empire's planets.
The cloning program was continued, but after the estabishment of the Empire, normal recruiting programs came in use. after all, a normal man, takes about 1 year to be trained, and a clone takes at least 10, not to mention infrastructures costs, and technollogy
Han Solo was one, but deserted.
As for height, all armies have minimum height requirements... no wonder that the Empire also have it
