I have a partial clog that is causing water released from my 2nd story kitchen sink to flow out of my 1st story washing machine drain. Clearing the clog fixes the problem but I'm concerned the clog will happen again due to the way the piping is configured. Is the present configuration acceptable practice and is there a better configuration? Is it worth it to reroute the piping if there is a better configuration? See picture. Thank you for any recommendations.