I am probably using the same base spreadsheet except I have adapted it to include "virtual shares" - so the columns will not match up to yours. I take trades as they come and do not wait for the monthly reviews. But you have to be prepared for quicker and perhaps deeper drawdowns. Sometimes this is not easy to do.
I can't remember who shared the following formulas on this forum. But they are what I use:
Next Buy = (Portfolio Control - Min Buy$) / ( Total Shares X (1+ Buy Safe% / 100 ))
Next Sell = (Portfolio Control + Min Sell$) / ( Total Shares X (1 + Sell Safe% / 100 ))
Hopefully somebody with more AIM experience can double-check to see if these are correct.
I took a page from my LD AIM Excel Sheet and made up a workbook with it which explain the various formulae in each cell which I 'reverse engineered' from standard Lichello calcs. Basically a step by step calc as if you were doing it with a hand calculator; only it's done for you! The Hold Zone is the next price and quantity to Sell or Buy based on your settings. Current Price is not needed if you're predicting the next transaction on either side, which this simple sheet does.
If you want it, drop me an email to biggrabbergrabber@gmail.com.