im gonna talk about my experiences and bet it'll work for you as well.being 3 weeks into flower means you are still not too late to train it.there is a method called supercropping.you simply apply pressure to the branch you want to bend,break its inner muscles and tie it down to make it horizontal.but note that ; you only break inner muscles,we dont want any cracks on stem's surface.this method not only helps you control the height but it makes the stem bigger,makes to lower bud sites bigger and any buds getting exposed to grow light on that branch after supercropping will get bigger.lastly,the top of that branch is going to turn up to light again in a day.removing leaves wont do anything,it'll only damage the plant.supercropping will help you control the height,make stems a lot robust and get more buds exposed to the light.simply put pressure on the branch,break inside muscles with your finger moves squeezing,when it gets loose,tie it down with some rope.apply this to a few branches at most a day,repeat four days later but dont get late because you are already in week 3 or 4 of flowering.search for super ropping on internet.growweedeasy is a nice website.good luck.