I've talked to folks who traded for 40 yrs, and still don't know about this method that I use.
Wrong. This method has been used by a lot of people over decades.
Is it rare or is it common?
Is it only you who knows about it, or also others too?
It is both common and rare. It is common because everyone uses it's individual techniques, but very few combine them, or know how best to combine them.
In my opinion, 99% of those that trade stocks haven't tried this combination.
I've talked to traders, and NONE so far uses this technique.
Also spoke with Finance major Master's graduates, with 3.5GPA.... They never heard of it, and of course, think it's fake.