For anyone else who is looking... from one novice to (perhaps) another...
After spending half a day reading "how to program in MQL4" web pages (isn't the internet useful!), I concluded that the best way to get the maximum value (or minimum, or whatever) in a set of formulae was to do some custom coding, which I did in the "Custom MQL4 Code" block available in the excellent FxDreema.
So, the image shows what I end up with in the user interface:
[attachment=0:20z7n1i0]http://forum.mql4.com/35725 for more information.
My especial thanks to Mr fxDreema himself for his help with this.
......
formulas.jpg

