Defo cancel your first night
ADR. The Boardwalk Bakery have a pizza window where you can oder a large pizza for 2 QS credits, that will feed all three of you easily.
Last year, the beginning of November was amazingly busy and caught a lot of people by surprise. There is the Wine and Dine half marathon weekend on 4th/5th so Epcot will be very busy in the evenings.
Plus, Epcot should always be avoided during the weekends anyway, when the Food and Wine festival is on as a lot of the locals are there enjoying the refreshments on offer. However, your position at the BC means you can easily ' pop' into Epcot in the mornings and be unaffected.
BTW, Teppan edo is a fab restaurant in Epcot and I would highly recommend.
As others have said, book FP's for all your days. Don't forget the Frozen ride at Epcot.
Please make time to see all 4 parks fireworks/evening shows as they are amazing and part of what makes Disney so magical.
Have a great trip.