Hi C, Re: "By leaving the safe sell at zero, doesn't that build your cash too quickly in good markets?"
I use other methods to contain AIM's enthusiasm for building up cash. Once I've reached a cash threshold that seems appropriate for the current market risk I avoid a Sale by raising the Portfolio Control by half the Sell Market Order value. That also raises the Next Buy and Next Sell targets. You can read more about it here: http://web.archive.org/web/20120811055900id_/http://www.aim-users.com/diction.htm#q7
One could use the v-Wave risk indicator to judge the appropriate upper cash threshold for using this method.
Re: SAFE incremental increases with buying - "As a matter of interest what was the highest you have ever got to? "
I believe 35% is the highest I've had Buy SAFE rise on sequential buys. That would be the equal of five sequential buys assuming SAFE started at 10%.