We have a chalet style house in Minnesota where the front 2/3 of the house is open 2 stories plus and the back third has 8' ceiling and loft above. House is 27' wide and 40' front to back. Bought it a few years ago and don't know who did the work. It has in floor radiant heat and the open front area is always 4-6 degrees colder than the back area. The thermostat is in the back. We want to even out the temperatures. Boiler is located in the center of the back 1/3 and it has a Wirsbo old style manifold with six tubing runs. I don't have any idea what run goes where. The lengths are 231, 221, 200, 230, 168, and 189. How can I identify which runs go where so we can adjust flows or even break it into two zones?