Your mains should not get any LFE (.1) info, unless you set them to Large, and your Pre-Pro to "no subwoofer". I have just gone through this, and discussed with both Cary and Denon to make sure when setting up my system to pass HT info through my preamp. I wanted to use just one sub, and use it for both HT and 2 Channel, but the only way to do that, practically, was to set the PrePro to "no sub", send all of the info through the 2 Channel preamp, then cross over the sub between the preamp, and the amps for the front speakers. So then I would be processing the signal after the tube preamp. I just got another sub instead.
I hope this helps.
I hope this helps.