String of losses are not random. Albeit, Trading involves skill*. Without skill, then of course you will deal with a "string of losses". First get skilled.
Once you have skill, solve the actual problem, by finding the precursors to a "string of losses" and minimizing it into irrelevance.
The reason I say this is the fact the solution mentioned can be described as, two extremes, a neutral point, and increments, a simple scale of first order trade tactics.
This type of "quiver", suggests it is "played out", wrt to first order issues. Basic Model theory. Hence why you are asking for alternatives. Perhaps something non parametric in nature or some exotic scaling as an alternative. NB the fact it is a "string" does not mean it needs to dealt with as a "string", with solutions that work on "string" type problems, or solutions that have string like properties, like scaling. Hence why the solution you threw out, and I mean threw out, is so meh.
Instead these issues can be handled in the Meta System, or Testing Harness. These second order systems, can have non parametric measurements and controls that are better suited to non random first order events, string like or otherwise. They can act as a bridge between the parametric first order events and the non parametric measurements that inform the control of the trading (first order actions). This is where meta skill is encoded.
Does not matter if it is the system or the trader. They both need a Testing Harness or Meta system. Otherwise you are stuck with first order solutions or a mishmash of first and second order solutions in a single model. The latter is not a good foundation for orthogonality, scaling, testing or maintenance.
The Test Harness needs to be actively influencing trading in real-time and remain dynamically adaptive to the first order events (trades etc.) as they happen. It is pretty straight forward once you setup the models, and can be setup to solve first order issues with non parametric solutions. It is also how you would evaluate any would be, first or second order solution, parametric or non parametric.
Best of luck
*Skill means you can deftly APPLY all tools in their variants, at the right time, under all the conditions, dynamically, ignorance not excused.