Hi Hyperdimension,
I appreciated your discusion about backtesting. I would like to do my own backtesting also; for this reason: I suspect the vendors' default settings are faulty. It seems they always hand me a robot set to scalp about 10 pips or less; but they have set the stop loss at 60, 100, or even more. These huge stop loss points give the robot a win ratio in the 90's (a good sales
point 
); but I would be happy with a win
rate 
of 40%, if the take profit were 3 times the stop loss. Backtesting at different T/P vs S/L points should reveal whether or not the vendors' are padding the stop loss to give their robots a higher win
rate 
. In manual trading, I would never place a trade with a stop loss
point 
10 times larger than my take profit
point 
.