I noticed that the voices seemed to have too much bass with the Seattle HD feed as well. I could still hear OK, but it was just different from the other shows I was watching. Perhaps someone who watched the Eastern feed could chime in with their observations.
For those of you with simsub issues, I would phone your provider and complain. They shouldn't be cutting off the last 2 minutes of the previous show. If they can't delay the simsub time for 2 minutes, then they shouldn't be allowed to simsub that hour.