Hi Sandor,
I like the idea of you switching out the robots once a week as this should help to minimize drawdowns, at least in theory. However, once in a while you will still suffer drawdowns as you experienced. For this reason it is a good idea to keep risk under control. So, again I liked the idea you reduced risk after having undergone a large drawdown. In the future I would suggest keeping risk low. To keep risk low when you first place the robots in MetaTrader look at the drawdowns for the EAs in the Prop Firm or Top 10 app for each robot you plan to trade and make sure their total drawdowns to not exceed the loss limit you are willing to accept. If total drawdown is greater than the loss limit you can accept adjust the lot size. Good job!
Alan,