Cleared the first half's stages. Not too shaby, I three-medal'd all of them first try, although it was a little close in th third stage. If you make too many circles there, the bugs drop down your squads' health too low and when they reach the boss, they don't stand more than 2 turns. Thankfully, my helper squad was very strong and I passed it.

It seems I'll be farming the ?-3 stage. It has a nice EXP/stamina ratio, HOWEVER if someone wants to level up his/her knights more, then you should go back to 4-3 and 5-4 and start farming.