I disagree with all in or all out because there is no way for you to know if your trade is going to take. In fact, one of my "base" cases for a new strategy is whether it is better than random entries with the same money management. Taking little wins allows you to offset little losses which lets you take big wins that are the sweet spot for your strategy.
Have to keep at least 1/4 runner however low odds(trailing with wide stop - 50% retrace is ok). Screw the stats, gotta have some excitement!