These kind of things, for me, take some trial and error to get just right for the position I want. A couple of suggestions: move the brifters to a higher position on the curve, rotate the handlebar, slightly, so the flat area is a bit higher, shorten stem, maybe flip stem to a rise instead of drop. Do changes one at a time, in small increments. Little changes can make a large difference in comfort. I find having the flat, leading to the brifters, works better with a very slight rise to give my wrists a more neutral position.