What could be a valid EJ trade today could be what I call a "salvage" trade. To some extent it has the same problems as a "reverse" trade i.e. when to execute it. Well, publishing notes on this thread makes me think how to present such a concept and remove at least some of the vagueness from it.
The basic concept of a "salvage" trade is that when there is insufficient pips to at least achieve a 1:1 profit target of say 45:45 as there is today, one can wait for price to break out the box and then hope that price will now retrace back into the box and then one can execute a trade in the original direction in the knowledge that a 1:1 profit margin is now achievable. Hence I reported that after allowing for brokerage there were only 37 pips available for a 45 SL (incidentally, I would not restrict my SL to 37 to compensate as I don't feel that is enough cover for my one a day EJ trades).
Now, what quite often happens is that when a trade does trigger on the EJ price can just shoot up or down and one doesn't get the opportunity of executing a "salvage" trade. (which is why I am taking the chance, whilst monitoring closely the ordered EP this am). But let's assume that price does break the top of the box today. My new rule is that as long as price does not go forward by more than 20 pips and then retraces back into the box and does not go back more than a max of 30 pips then one can execute a "salvage" trade. Same SL & PT at 45. However, within that 30 pips retrace (on the M15 chart) there must be a sign that price (in today's example) is now showing a sign of going back up again. For example a finished green candle longer than the nearest red one(s). This does involve watching the charts for the EP. It is no use trying to go the opposite way if price is on what looks like an unstoppable run to the downside (that's just being silly). I hope that this helps explain the "salvage" trade a bit better.
In relation to the "reversal" trades price price must be close to the 3 day average and even better gone past it and now look like reversing. As above there must be a sign that price is now showing a sign of reversing. For example a finished green/red candle longer than the nearest opposite colour on the M15 chart. There are many variations in the price pattern and an indication of price reversal can show up at any time, however a number one rule is that I will (including the reversal sign) never execute such a trade unless I have at least a 30 pips buffer form the extreme of the 3 day average. And, it should go without saying that if price is tanking along in its trend's direction I would not attempt a "reverse" trade, Once again this would be a stupid idea. Trying to identify when price has finished its run on the EJ or any other currency pair for that matter is one of the most trickiest challenges in FX