Backtesting "results" can be manipulated to convince the trader that the system "works" and the outcome is sufficient to warrant trading real time (money...real money ;not simulated trades.) Forward testing is ,of course, real time where the trader can continue to test the method under real time conditions, which will highlight price slippages,current market conditions that are not easily identifiable in backtesting, and the opportunity to streamline stops and profit levels. The only thing you are doing by forward testing is losing time, but getting the satisfaction that the applied method will be suffiently profitable to commit.
Also requires to know what a best setup is. Not all setups generated by the same rules perform the same way. Some generate loosing trades and some winning trades. How can one predetermine which setups are better than others given that they are generated by the same rules?
The most important rules for intraday trading success are: 1. Hold your LONG until it is time to go SHORT. 2. Hold your SHORT until it is time to go LONG.