You are so correct I had my system "professionally" installed. It was so poorly designed that I haven't even contacted them to tell them. I cannot believe that company still exists. I'm done being pissed, as a student I put in a whole summer's wages for the system. I have washed my hands of plant drive and am trying to save enough money to redo the system.
It's working now, but I'm not sure it will be working throughout the winter. I'd like to make changes similar to your suggestions but I can't find anyone I trust to do VO work in Canada.