My only experience is with full 1.0-1.2 liter pots, but I use a 15:1 or 16:1 ratio and a medium fine drip grind. For light to medium roasted coffees I tend to use higher temps (mainly 204) because I hate sourness or too much brightness, but like the flavor profile of a medium light Ethiopian natural brewed hot.
For filters, I use Bunn filters, which are taller that standard flat-bottom filters (I have not tried Kalita Wave filters). This might not matter if you are not doing full pots. If you are using 80g of fresh coffee for a 1.2L pot, it makes a difference.
I usually use :45-1:00 pre-soak time, although occasionally a very fresh and gassy coffee needs a little more time to avoid some bloom overflow. I don't keep the carafe out during the pre-soak, since my primary purpose for using it is to avoid having blooming grounds get on the showerhead and around the top of the basket.
The inside of the carafe does become discolored over time, even with paper filters and daily brushing with soap and water. I periodically dump some oxyclean in there with hot water and it removes the discoloration without any effort. A regular soap and water brush-out easily removes any detectable trace of the oxyclean.
The big annoyances of the Brazen Plus:
--Very drippy/splashy pouring, more so than any other carafe I've ever used (and the original Brazen was supposedly worse).
--Water gets inside the carafe lid when you wash it. The only way to really get it all out is to unscrew the parts to get at the space in between, but I no longer bother and just get as much out as I can with violent shaking over the sink. Any wash water that might remain in there is out of the path of the coffee.
--Water also gets inside the filter basket when you wash it, but there is a weep-hole between the parts, so it is easy to shake the water out.
--The carafe also seems to get a little water in various voids and seams with normal washing. If you violently shake the carafe, drops come out of odd places.
--The carafe is not a great insulator, but I always preheat it, and it generally keeps the coffee acceptably hot for the time it takes me to drink a pot. But it's nothing like a real Nissan Thermos.
--The showerhead retains water so that after you remove the filter basket, it drips a lot. And if you blot under the showerhead with a paper towel, a lot of water comes out -- enough to saturate a full sheet of Bounty.
But overall I'm happy with the coffee it makes, and the positive features outweigh the annoyances.