My technique to take down the chute is to kneel on the back of the trampoline, facing forward, with one leg slightly extended to put a foot on the tiller bar. The foot does the steering while I use my two hands to pull the spi in the bag.

I also throw the tiller extension over the back of the boat on the downwind leg, so it's not in the way when I snuff the spi, and this also helps keeping the rudders stable.

But looking back at last season my most spectacular capsize was at the UK nationals in Mumbles where I bought it snuffing the spi right as a wave lifted the back of the boat around sending me into an uncontrolled surf session which ended rather badly So it's not like it's a foolproof solution either...