The pictures help immensely. You need wood rafters to support the OSB roof sheathing. What is existing (unless the rafters are under the OSB) is dangerous. Your thermal barrier should go across the flat ceiling (the one with the fiberglass batts facing up rather than down toward the warm room side) under tha beam, across the floor to stop and go up the knee wall, extending up the sloped ceiling across the top attic ceiling. Or, insulate the rafters: fig.4; http://www.buildingscience.com/docum...ty-insulation/
Stop the air from going under the knee wall. Housewrap on the attic side of the knee wall insulation to prevent wind-washing.
Far as the ff XPS on the ceiling, it will work for wintertime. Long as it's air-tight (seams taped/canned foam) and covered with drywall for the thermal (fire) barrier, check with your local AHJ. Be sure to remove the paper facing on the batts, simply slashing them will do nothing. With that much foam, the drywall fasteners may be a problem...
It would be similar to SPF, then venting above that in a cathedral ceiling; pp 70; http://www.buildingscience.com/docum...n-roof-venting
Clothes taking longer to dry?
Clean the dryer screen in HOT water if using fabric softener sheets.
They leave a residue that impedes air-flow, costing you money.
Clean the ducting in the last six months? 17,000 dryer fires annually!