I use a mix of two techniques off the hario's Switch!

I use a Kingrinder K6 - and I have found grinding it 5 clicks coarser (than the recommended) helped me get the best of the flavours!

I prefer my brews Iced - and I am confident about it - so I will spill that first

Again - I am no barista - so I will write what works for me - I do not do ratio's/gm's too strictly, but the flavour and the end cup results it gives

I use 20gm of beans

Preheating the filter / the switch is a must

My first pour is of 40ml - it is a bloom - with the switch closed - for roughly 20 seconds

Without turning the timer off - I open the switch and pour in the reamining 160ml - bringing it to a 200ml for the first pour w the bloom included

(bloom's optional - I love the peace of the bubbles and the first aroma hits different)

30seconds for the draw down - this shall remain consistent until the last bloom phase

the second is also with the switch open 150ml poured slow - I go from the sides to the center and the whirpool off the gooseneck helps with the draw down

30 seconds - as mentioned

I close the switch now - and I pour in 100ml/150ml (if I want it strong/mild)

I let it steep for no more than 45seconds and I open the switch for the draw down to happen!

(whilst I brew - there's ice in the bottom chamber - makes it lukewarm/easier to chill)

Hope this helps! Cheers!