This makes no sense to me. If you are using a good platform with good tick by tick feeds from a good data source there should be no slippage at all either in simulation mode or in historical chart replay. Sierra Charts and CQG would do the trick. 40 Ticks? that is 10 full NQ points!!
Bottom line is that your system may be way better than you think it is if you are starting with a 10 point deficit on each trade.
There will always be 1 tick of slippage if he using market orders (I think he is).
I traded NQ using a fully-automated system for several months in 2018. The slippage would be anywhere from -10 to +10 ticks (market moving for or against me after the entry condition was met). However, the average slippage turned out to be just 1 tick, which was the spread 99% of the time.
