To be honest, I've tested a lot of moving average type systems as well and been totally underwhelmed. Something I did notice though, and you probably won't believe this - try reversing the signal direction :-)
Have a look at my post on backtesting, the 'profitable' chart I showed was actually a MA cross system in reverse. That is, when the Fast MA moved under the Slow MA it bought, and when it crossed back above it sold. Exactly the opposite of what the system is meant to do, but it made money...
https://steemit.com/trading/@tradergurl/the-benefit-of-backtesting
Will be interesting to hear about your bot experience, thanks.