I understand where you are coming from and I wish I had the money to buy a brand new 4 bay system but unfortunately I don’t so the only thing I can do is just fix it
So the lines I have plumbed are 1/2 I’d for the rinse and 3/8 I’d for the soap and wax lines that older looking check valve is a 3/8 should I upgrade it to a 1/2” one