[pcabc]

Regarding the 10 and 30 day EMAs - did you pick those for a reason, do they have any special significance?

There was a reason. But I can't remember exactly now as I set it up around 10 years ago. But I do know the McClellan Oscillator https://www.investopedia.com/terms/m/mcc...llator.asp is made up of the 19 day EMA and the 39 day EMA of the advance decline line data. So the 10 and 30 day EMAs that I use are just a bit faster and obviously tie in with Stage Analysis.

I think with things like these you could use any combination of short and medium term MAs and the results wouldn't be much different. i.e isn't the MACD a 12 day EMA – 26 day EMA for example.

If it has worked well for you that is explicitly a good reason to not change it.  I've been using 20 day SMAs for a while, I think from Trendavisor, but it is a popular time period.  I formed the impression for recent years that 150 day MA was very slow and 50 day SMA was still quite slow for a trader.  So the 20 day SMA is my 'is it above the 20 day SMA then just leave it alone' test.