Hello Maria,
one thing to keep in mind here is that the brokers offer a different number of Historical data bars with different assets.
Have a look at your data, and you will see that for EURUSD you will have more bars that for AUDUSD for example.
This difference could change the performance of the generator when using the same acceptance criteria which is logical.
Now when you get used with the EA Studio and you generate daily strategies you will know what acceptance criteria to place for any asset quickly.
Not a bad idea to make an excel table where you place the currency pairs with the acceptance criteria and the values that worked best the last time.
So when you run a generator for any asset you can have a quick look at it, and see the latest acceptance criteria that you used. It will save you time.