I am now using MotiveWave for quick studies as I did here. It minimized the time spent to develop in Python where I can get the visuals with indicators/studies to see ideas quite fast!

I found testing for standard deviation here was inconclusive as compared to rate of change. I did discover something that seems to work nice for low latency crosses for entry/exit conditions.

 

Note that I am affiliated of Motive Wave which mean I can help you in this killer platform if you are interested.

 

https://quantlabs.net/blog/2019/05/motivewave-study-for-forex-pair-with-indicators-i-like/