Ok, I'm gonna make a distinction here between reason for trade and entry. My reason for the long trade has to do with how I think the probability is for getting an up move today, and how big and when. With no morning pop to the upside which I had expected, I took off the position from yesterday and looked to buy back cheaper. At the entry of a long position, I try to take advantage of weakness, and that's why I started with a limit order under the market. It would have been an ok entry if I had waited for it to be hit but I made the mistake of chasing the market as I misjudged and thought we had seen the bottom. The probability of upside from here on has not been changed by the downmove in my opinion though, and I still expect a bounce during the day, perhaps now only to the point where I am not badly hurt, but still. I must keep with my analysis which is that this market is oversold and bound for upside. I might be early, but by this time next week, I think I will be much happier by continue trying to buy weakness.
Sometimes prices going lower means there is a bigger probability of further downside, sometimes it is more like the last stretch of a rubber band and we go back up. I still think we will have some kind of rubberband or I would already be out (incidently, if we do not get it, probability favours further downside on monday morning, a case of downside leading to downside).
Stop losses based on price tend to be taken out at the worst possible time and that is why I never have a price stop loss per se, rather I try to use time limits, and pattern stops. As you can see, I am not a trend follower, rather a contrarian. Who's very out of sync in his timing right now though... and I might very well be wrong on this trade, but I would be even in worse condition if I did not follow my play book.