Hello
My thoughts about 10tp and 40sl are that the risk reward ratio is not good, if you have a loss you have to win daily for a week to get back to where you were. Before I say more about it I'll just mention 20/40 is a dumb useless set, so I'd suggest you need to be content with 10 and not try for say 15 every time (not that I've tested that), and you also need to leave a fairly big SL in order to give the market room to breathe.
My analysis of 10/40 says it has won 47 of the last 50, 93 of 100 (including Christmas which was terrible), 140 in the last 150 185 in 200.
With all that in mind, I'd be happy to use this one with a higher % risk instead of a lower one actually.
I've only observed 2 consecutive losses in 15 months