Kiril, Thanks again for all the help - you have been a massive help. I got lucky and found a friend that has done many professional installations, was able to take your advice + his and finish the plan.
The one bit of good news is that I got 11GPM at the backflow vs. the hose bib at 7GPM.
The one contradiction he had with you is that with these colder climates he wasn't as big on having so much pressurized PVC and limited the manifold boxes back down to 3. I am sure this is just a preference thing, but he said sometimes youre just better off spending just a little extra on poly runs than have a mess.