In a small bowl combine the chopped rosemary, sage, garlic, red pepper flakes and olive oil. Season generously with salt. Using your fingertips carefully work your way under the skin of the chickens to separate the skin from the breast to develop a pocket. Schmear the herb paste under the skin of both chickens. Use all of the paste and try to distribute evenly. Drizzle each chicken with more olive oil and massage the skin. The idea here is to lube them up like suntan lotion. This will really help to get a nice brown crispy skin. Sprinkle each chicken generously with salt. Truss each chicken.
Place the diced veggies, bay leaves and thyme bundle in a roasting pan large enough to accommodate the 2 chickens without touching. Usually a 9 by 13-inch roasting pan will be perfect. Add 2 cups of chicken stock and season generously with salt. Arrange the chickens on top of the veggies in the roasting pan and place in the preheated oven.
Check the chickens about 15 minutes into the cooking process, the skin should be starting to turn a lovely brown. Lower the heat to 375 degrees F and continue roasting. After another 15 minutes, remove the chickens from the oven and turn over. At this point check the level of liquid in the roasting pan. If most of the liquid has evaporated, add another cup of stock and return the chickens to the oven. When the chickens have browned on the bottom, about 15 minutes, remove them from the oven and turn them back over. Return the chickens to the oven for the final 15 minutes of cooking. During this time the skin on the chickens should be very brown and crispy. Remove the chickens from the oven and take the temperature in the crease between the thigh and the breast. (When doing this be sure not to have the thermometer probe touch a bone or you will get an inaccurate reading.) The thermometer should read between 160 and 170 degrees F. When cooking poultry in general the rule is 17 minutes per pound. If the thermometer reads less than 160 degrees F return the chicken to the oven for an additional 10 minutes and then re-check the temperature.
When chickens have reached the proper temp remove them from the roasting pan, place them on a warm platter and cover loosely with foil. Let sit for at least 10 to 15 minutes before carving.
After the chickens have been removed from the roasting pan, skim off the excess fat from the surface of the liquid. The easiest way to do this is to prop up 1 end of the pan and allow the fat to run to the other end of the pan. You may not be able to get all of the fat, which is ok-fat tastes good! Put the roasting pan on a burner, add the wine, bring to a medium heat and reduce by half. Add the remaining chicken stock and taste. Add salt if needed- you probably will need salt. At this point you can decide if you are a "strainer" or not a strainer, meaning if you would like to strain the chunky vegetables out of the sauce or not. I myself, am not a strainer. When the sauce has reached the desired consistency and flavor remove from the heat and pour into desired serving vessel.
To carve the chickens: Cut off the twine. Pull the thigh and leg away from the breast of the chicken until the thigh bone "pops" out of the socket. This is also a sign that the chicken is cooked properly. Separate the thigh and drumstick. Remove the breast from the carcass by feeling for the ridge of the breastbone in the center of the chicken and slicing around the rib cage. Arrange the chicken on a serving platter or on individual plates with the mashed potatoes and gravy