Chris, you are right about it not always pulling back to the 37 SMA, but as long as you wait for a pullback of any kind, preferably to a minimum of the mid boly or 10 EMA on the 1 min chart, and you enter on the first 1 tick break back in the direction of the trend, you should be okay most of the time. I rarely enter on a limit order at the 37 SMA. I usually want confirmation back in the direction of the trend.
The other critical thing is that once you are filled, make sure you have a stop that is placed 1 or 2 ticks above the high of the pullback (if in a downtrend), and you need to have the guts to let it breathe. If you get stopped out, it is usually a sign that the trend is near an end, and be prepared for a reversal.