Hi, here is my recommendation presets for Mastermind GBPUSD. If you can, try to test Grid step simultanously with your decision of 10, 20 and my 30. So you can make better decision because of risk. Lower Grid step menas ofcourse more positions. Better use in my opinion Lot multiplier 1,44 and max 5 positions each side. Rest as standard. But of course you can test any combination you wish.
Load tickdata from tickstory.com to have perfect backstesting result. Registration is free, you can download data from the past year, so 2020. But you can only load data for 2 pairs each day I think (not sure). But only with correct tickdata you get a good backtesting result.
TRS2016 (or Master EA, this is just another name for TSR2016, I bought Master EA in May) is not Mastermind!
Optic of Mastermind is similar to Life changer. Life changer is not the best, but really ok, use M5. Unfortunately Lifechanger can't be backtested like all existing Multicurrency EA.(I don't know any where it is possible).
Now you can test a lot.....
wish you all the best and lots of money