For intraday short term trades on ES and ZG I use .5 x 3.
For swing trades in YM I use 25 x 3 or 50 x 3 depending on my level of comfort with the market. I only take triples, quads, spread triples etc. I am looking for lock trades on long term trading so I probably only will trade two or three swing trades a year but they will be big moves. I still scale out and keep a runner which I trail a stop one box away from the previous low or high ( this essentially gets you out on a double top or bottom with a stopped out runner)
For USD/JPY try .025 x 3 and see the huge moves you can catch in this instrument. It is important to use mental stops with forex, never set a hard stop they will find it.
Basically you can do a little research on the net to find the appropriate box size for a given price.
I do not personally use the previous top as a target. I find that the best moves will always have a couple of retracements. As long as each retracement makes a higher low or lower high (for shorts) my stop management will keep me in the trade. You must have the confidence in your method to watch the price retrace and take some of your unrealized profits. You should definately paper trade these charts before you dive in so you know what to expect. I do always move my stop to my entry price as soon as my second mechanical target is taken out. I do not vary my first two targets. You will sometimes watch your first target get hit then get stopped out. It is ok, if you reduce the target sizes too small you will never make enough on winners to pay for stop outs.
My win rate is nearly 70%, so if you are selective with your trades, and follow the rules you can do well.
Oh by the way, I never trade between noon and 2:30 Eastern in the stock indexes and usually try to trade gold between 5:30 and 11:30 Eastern. Most of the best signals are in these time periods. Trade when the market is moving.
