>>>>Put new cash where it is needed. But what happens when the formula tells you to own very little stock because stocks are near their highs? Maybe re-balance between the stock ACCOUNT (even though most of it will be cash) and the cash ACCOUNT (which will always be cash (or bonds).
This is what I plan on correcting next, right now my buy/sell triggers are getting in the way.<<<<
This is only an issue if you are trying to get a computer to do it. Whatever stock to cash account ratio you want you can rebalance to every 3 months or once / year without too much trouble.