Good morning Jimmeh. I am glad you have been doing your back testing. Although you have found several situations in which you could of made much more profit, the reality is those trades are very rare. The market most of the time (EUR/CAD) has about a 60-100 pip range. As a scalper you should be aiming to get about 30% of the daily range scalping, in of course which you use your free margin to give your account a boost depending on the formation which you see. Although, one could hold for bigger gains, the reality is you stand a greater chance of giving your profit back, or running into a losing streak due to your outlook of bigger profit.
Basically as a scalper you should have 0 bias. You enter your trade, and once it's closed your looking for the very next setup. By maintaining that outlook (placing your trades on the color change, or the engulf which occur inside the bubble), you remove the bias from the picture. Please recall that my intent is turning over my account as quickly as possible by getting very accurate entries and penny pinching the market.
Also the way you are back testing (taking it one candle at a time) is the best way to back-test, as this gives a feel of live trading. Backtesting that way also gives you the chance of practicing your stop loss/ hedging, too. As you begin to back test more, certain formations will standout like a sore thumb, and you should back test looking for that specific formation. The beauty about scalping is that, if you have utter discipline you can turn over your account very very quickly. On the other hand if you become bias towards any one positions while scalping, and your using high equity you will get your account called by Mr Margin very quickly.
There is a fine line between scalping with high equity, but that is why I say that it is much better to back-test high probability formations, and only trade those, then use low equity and scalp or swing.