I have a back to back toilet installation from a house built in the 70’s. After replacing the toilets I encountered the water skipping problem from one toilet to another. I switched from 3 inch to 2 inch valve toilets, but I’m still tired of one toilet getting drained, even when it’s better than when it was 3 inch valve toilets. My drain lines run horizontally and I’ve attached pictures of all of the connections so you can take a look at what I’m dealing with. I’m trying to avoid cutting out and redoing structure to fit in the double combination wye with the 1/8 bend. Would my diagram I made work? The old setup is on the left and the new proposed connections are on the right. I’ve attached pictures of all the venting and existing connections. Let me know if you need more info.