Would like to know how these new Barracks work? What is the difference between upgrading it to level 2, 3 or 4? Do you get stronger troops when you train. Is it better to wait till you have higher Barrack level before feeding your troops?
When you upgrade troops you get an increase in their percentages (best I can tell after doing a few is approximately 1% per level). Waiting would have the advantage of allowing more efficient upgrading as you can watch the cap get hit and any leftover troop exp is lost.