I think the lore is, Lucas wrote a scene in Star Wars where Luke uses the throw away term 'Clone Wars' becsuse it sounded cool. Lucas then decides to make three more movies about young Anakin and incorporates said term to make the movies 'flow like poetry' (paraphrased).
Stormtroopers where never meant to be clones. They are recruited into the Imperial Academy (where Luke wanted to go at the start of A New Hope) which leads to another issue, Luke says something along the lines of 'it's not that I like the Empire, I hate it, but it's all so far away.' If you hate the Empire then why are you in such a rush to join?