Here is the rub, per that post by Volperi:
1) Every instrument has its own behavior. ES for instance backtracks a lot. If you have methods that cannot tolerate that, it does not work out well. Likewise, you can go with the flow and use it to your advantage as he does.
2) If your mental model, or expectation of the instrument is "smooth trend" with minimal backfills, and the actual instrument does not match that, again it will not work out well. You are doing the square peg round hole thing.
3) The problem with a lot of folks is they want broad stroke methods. Some tool-setup-method, that applies in all or most cases. They think "keep it simple is best". Which ironically, is another broad stroke type thinking. The devil and the profits are in the details. That is why experience, deep long seated, around the block 1000 times, seen all the exception dozens of times experience matters and has no substitute.
4) Specifically, on buying down, aka, martingale, it is just a tool. If your discipline is emotionally compromised, you are not ready for that tool. ..... If you don't know your instrument behavior, you are not ready for that tool. If you don't know how to reverse, again, not ready. If you don't have the #5 below well understood and implemented down to tactics, you are not ready.
5) There are limited reasons for stops to be triggered-executed:
- Actual loss is too large by $, % or ticks.
- A signal generated to take a loss-exit.
- Need to go Flat, so that you can open a new position
- Extreme volatility or extreme non volatility. Examples of #2 above
- Loss of volume, i.e. RTH ending, market closing
- An event pending and you prefer to be Flat.
Outside those things, the only other exit is for a profit.