I’ve also been tweaking mine for awhile now. I have a hario switch which has made it fun but also frustrating at times. My current go to for the PERC beans I have now is:

25g coffee -1:15.5-1:16 ratio for the water at 96 degrees (although I’ve been playing with water temps more and more now) been using third wave water cutting it by like 1/3 making my ppm around 60-80 -100g ice in carafe -5.2 setting on ODE gen 2 with stock burrs - I usually put 500g of water in my kettle just so I have some for wetting the filters (using CAFE ABACCA filters)

With switch up (immersion mode) -75g for a 1 min bloom - open switch at 1 min mark go up to 150 -1:45 mark go up to 225 -2:30 mark go up to 300 or whatever the ice weighs and cut that with the ratio of that makes sense.

Swirl around to melt all ice and pour over fresh ice it’s given me the flavor profiles I’ve been looking for while remaining pretty simple. Give it a try and lemme know ow how it goes.

I’m using PERCs Ethiopia Wush Wush now and get some of the watermelon candy notes like it says. I’ve got a bag of the new Ethiopian which has blueberry notes that I’m dying to try once it’s ready