One off the things that I've done that has greatly reduced the misbars is moving them to grow out sooner. I was keeping the hatch together in the same 10g tank for almost a month before moving them to a grow out tank - now I move them at around 18 days of age. Makes a huge difference. Good work though!!! and you'll laugh because when you run out of misbars people will start asking you for them. I get requests for misbar snows all the time.