You’re not doing any favors to Ludwig by keeping him in the back. He takes a long time to charge even when directly exposed to tile hits. Using Ludwig’s full potential needs a classic V shape formation with him as tank. Other than this, your main defense problem, as I see it, is that you don’t have a reliable and constant blue defender. While being great heroes overall, your blues are a liability when run by the defense AI. You never know what you’ll get the next time they use their specials. On top of that, there are many reflect blue heroes, that’s why blue hitters are best kept out of a defense line. Except for the crocodile, who bypasses everything, of course…