When you set it to None you will get a Missing Output warning next time you open the project. Don't worry about that because your sends are now your outputs. However you could just set the output of the track to the buss. It's the same thing really. Sends do however give you a couple extra controls. I used to do it that way for quite a while but switched back to using the main outputs and now only use sends as parallel outputs. It's just a matter of how you want to work. That may not fix your problem though. Just a wild guess.
The most important thing is you know exactly what is being outputted and to where.
Also double check those interleave buttons.