oh wow ! Thank you for the great replies and the pictures. I actually never thought about a slosher. I guess I will try and build one myself then.
Actually this morning when I looked at the dry sheets of film I had to realize I scratched more than I thought yesterday. Nothing that would ruin the negs really, but annoying and something than can be prevented it seems. Thank you for the warning of the developer, I did still use 800ml for a stack of 6 sheets which is still plenty in a 5x7 tray I think. But my drums use 1300ml for 4 sheets and since I use one shot developer, this feels like more of a waste than it should be. I will set my eyes on getting some acrylic and will have myself a build project next week
Thank you again for all your help and the amazing tips!