Stop “Personalizing” a Proven Trading System Until You Understand What You’re Actually Doing
When you enter the markets, you really have two paths.
You can master a proven system, or you can become an inventor and build one yourself.
There is nothing wrong with either path.
The problem is when traders think they are doing the first while slowly drifting into the second.
Look at the lineage of growth-stock momentum trading.
William O’Neil influenced traders like David Ryan, Mark Minervini, and Dan Zanger. Then newer generations studied O’Neil while also learning from Minervini, Ryan, Zanger, and others.
Generation after generation, the core principles get passed down.
Each trader puts some of their own personality into it.
One trader tolerates a slightly larger drawdown. Another prefers tighter stops. One favors VCPs. Another gravitates toward cup-with-handle breakouts, flags, earnings gaps, or other setups. Their position sizing and trade management may differ around the edges.
But the meat and potatoes of the system remain intact.
This happens everywhere, not just in trading.
Most successful businesses did not invent an entirely new category from scratch.
They entered an existing market and executed better.
Maybe they built a stronger brand.
Maybe they offered better customer service.
Maybe they improved pricing, distribution, product quality, marketing, convenience, or the overall customer experience.
They did not necessarily reinvent the wheel.
They took something that already worked and found a way to execute it better or make it their own.
Then, every once in a while, someone truly invents something revolutionary.
That happens too.
But being an inventor is a completely different job.
Trading is no different.
If you want to invent your own methodology, great.
But understand what that actually requires.
Years of market observation.
Research.
Backtesting.
Forward testing.
Iteration.
Failures.
Data.
And enough evidence to determine whether your changes actually produce an edge.
That is very different from learning a proven methodology and then changing rule after rule because something feels uncomfortable.
This is where I think many traders get into trouble.
They hear:
“You have to make the system fit your personality.” or "You have to develop your own system."
And that is true.
But there is a very fine line between personalizing a proven system and becoming an inventor.
You change the entry criteria.
Then the fundamental requirements.
Then the relative-strength requirements.
Then the market-timing rules.
Then the risk management.
Then the sell rules.
Then the setups.
Eventually, very little remains of the methodology you originally decided to learn.
At that point, you are no longer simply modeling a system that already works.
You are designing a new one.
And if you are going to enter the territory of an inventor, you need to apply the same level of research and rigor an inventor would.
Otherwise, you can end up in the worst possible place.
You are not mastering the proven system, but you are also not doing enough research to validate the new system you are creating.
You have neither.
Then when the results deteriorate, the conclusion becomes:
“O’Neil doesn’t work anymore.”
“Minervini’s system doesn’t work in today’s market.”
Maybe.
But first ask yourself a much harder question:
Are you even trading their system anymore?
There is nothing wrong with mastering.
There is nothing wrong with inventing.
Just understand which one you are doing.
Because sometimes the edge didn’t disappear.
You slowly changed the system until you changed the edge.