Greetings Nxt7,
Firstly, I would have to ask what you meant when you posed the title question of: “How to improve reliability and consistency of technical indicators?
If in your mind you are asking, if there is a way to improve the capability of any given technical indicator to point out which individual trade will turn out to be a winning trade, then the answer to your question is an Unequivocal No.
There is no technical indicator that has this inherent capability. Nor is there any way to improve the ability of any indicator to tell you what will be a winning trade on a single trade basis. The reason is simple. The result or outcome of any given single trade is random and a function of probability.
However, one could reasonably argue that the HFT’s use indicators to accomplish this feat all the time, and they would be partially correct to a certain degree. But upon a closer examination of HFT operations, one may find that the reason for their uncanny reliability and consistency is based more on their unique access to market data, co-location, speed, and just plain outright and intentional thievery. These I believe are the real factors for them, more so than due to any inherent efficacy of their technical indicators.
Let me also add that from a "Mental Analysis" perspective, I believe this title question is likely unfortunately engendered by what may be an inherent constellation of False and Inoperative Beliefs about the true nature of technical analysis. In others words, you may be "unwittingly" harboring a number of falsehoods about technical indicators, which you have come to accept as "Technical Analysis Gospel”.
This Falsehood that led you to the conclusion that any technical indicator could in fact have this capability, is a mental error in the way you think, and what you are thinking. A mental error that will lead, and will cause you to experience future technical difficulties in your market operations because you are not building your market endeavors from a base of truth. They will not stand the test of time, or avoid the inevitable Law of Averages.
Now let me explain what I'm saying, and what I mean to say, before all the other ET Folks who believe as the Op believes, come out of the woodwork in fervent attack mode. Please understand, I'm not here to preach "My Gospel", nor to make any converts,...only to express my own beliefs and opinions on this interesting controversial topic, and present my reasons behind those conclusions.
But I do believe that in order for one to ask a question such as this title suggests, one would first need to have a Belief System in place that currently accepts as truth that;
“A technical indicator is in fact capable of selecting a winning trade on an individual or single trade basis.” This is patently not true.
Understand, technical indicators cannot tell you that any individual trade will be a winner or a loser on an single trade basis. But technical indicators, when properly used and structured, can tell you whether the statistical odds favor a particular trade, and whether those selected trades will be a Winners or Losers on that Probabilistic Basis.
In other words, by and large you can have the ability to Win the Game over a Statistically Significant Series of Trades, provided you have a positive probability. That's because in this case, there will be more Winning trades than Losing trades, and that truly represents a statistical odds advantage “Edge” in the market.
Sadly, these falsehoods of what indicators can and cannot do, are shared by many neophyte traders, and even a few experienced TA practitioners. And these views are highly pervasive in the whole TA Community at large. I also personally believe that this one single falsehood belief, is largely one of the most significant contributors to most of the trader failures in this field of endeavor, at least in my experience.
And that,...in my opinion, is my 2 cents worth on your question.
I hope this helps.
KDASFTG