Hey Edu,
for the first post:
The Optimization results seems better, and I think the Monte Carlo looks just normal for the number of bars you have. Later when you have bigger number of bars, the strategies will get more and more robust.
The USDJPY looks so much better. I see on your FSB back test that you have more than 300 count of trades which is a reliable number.
Also, when you perform the Monte Carlo, you can select the last two options together. No need to do it separately.
Cheers