Try unplugging the electrical connector to the 50C "tranny softener" switch and see how you like it. This will stop the flaring, though it may firm up the shifts more than you like. Remember, MB trans shift more firmly when cold. I found that I needed to disconnect mine after changing to synthetic ATF (Mobil 1). No flaring, and the syn ATF shifts very nicely on the coldest mornings. Problem solved.