Filter brewing for the Soekris R2R

hello guys, Im wondering what people think is a good soft or smooth filter for the soekris dam1021 v4.0, as I seem to find the Dac harsh and fatiguing at times? I have tired some of the standard filters and someones custom NOS filter, I come directly off the ladders into a valve buffer that uses 8SN7, they are quite neutral and don't add much beside buffer and volume control In this case. please advise