Sorry if this is a duplicate post - something odd happened when I tried to post! 

How do you zero in on a good set of settings?  Looking at the heat maps from earlier in the thread it doesn't seem surprising that I'm having trouble tweaking settings to "walk towards" a good setting as pushing along any given setting makes it better, then worse, then a bit better etc.  So short of going with numerology or random luck how do you identify a good group of settings.  It certainly seems possible (hence quoting PuertoLibre below) but I don't know where to start or what tools I need to use to help.

Any suggestions gratefully received, especially as the overwhelming advice seems to be that one has to adapt to changing market conditions which requires the process to be repeated - which first requires a process!

Thanks

Miles