After a while, searching the MQL4 community looking for an explanation on how to calculate the highest and lowest values for a data series over "n" bars; I end up with this indicator that display exactly that.
There are various post explaining how to use iHighest and iLowest, i acknowledge all of them. This is just an application of it that suited my needs.
Feel free to use it and modify it.
Grid is a money maker in weak market, while a disaster in trending market. Maybe you can consider close all positions at some time, and run it totally again at another time, just like a fisher. This is AIGrid System With Manual Control.EA_Fibo_Avg
EA based on the indicator Fibo-Average-2B.mq4