That's not too bad, you have a 42% chance assuming you balance speeds well - so most people will get it in 1 - 3 runs

3 go down the bottom 2 through the top - and each one of them 2 have 75% chance on each gate

...If you REALLY played with speed you could get away with 2 down the bottom - giving you a 67% chance - but that's not that realistic