Thanks for the replies,
I have been using AIM again for about six months since finding the spreadsheet and re-reading the book. Still had some funds which ended up as Buy&Hold and are now AIMed again.
The min/max share value safe was more or less born out of my question of where to set safe as some funds seem the have a larger swing than others, looks like a larger swing is also better of with a larger safe?
Choosing min and max share value could be done by looking at the history I guess, it doesn't have to be precise, initially it was just meant to ballpark the safe...
Shifting the safe gradually from buy to sell is done by excel so not much emotion in there. I must admit that there is a good chance of draining the cash quickly if the share value drops below the initial min share value...
I did start to get the feeling that I overcooked my stew a bit, probably best to stick with normal AIM and leave this "project" for what it is ;)
Thanks again for your opinions/advice.