RSX is by it's nature "smoother RSI than RSI" without additional lag and because of that it has much less signals than the RSI.
RSX is mainly used in combination with levels or with a sort of
signal lines. Some prefer the levels some, on the other hand, "signal"
line. We could dispute which one is the better, but it probably mainly
depends on trading style.
Here is a version that, in some way, combines the two types.
signal lines idea is simple: when RSX value is above central value
(RSX being 50), then only the upper signal line is calculated, and the
lower signal line value is "inherited". When the value of RSX is below
central value then the lower signal line is calculated and the upper
signal line is "inherited". That way we are getting a kind of
combination of levels and signal lines without a need to change the
value of the RSX itself. As it is obvious it has its better sides
compared to both methods (especially avoiding some problems with
"trends" when signal lines alone are used). In any case extensive
testing is advised.