Frontenac can certainly have a very strong taste with very fruit forward aromas. If you want a light colored wine, press immediately after crushing, a couple days like you say will make a flavorful rose to light red wine. When left to ferment all the way, it develops deep flavors and increases the body. No need to worry about color extraction as frontenac has very deep pigments. MLF will increase mouthfeel and add complexity to it. Oak is optional, but it will hold up well to oaking. I like to use grapes around 25-28 brix as it has the best flavors at that stage when they develop a plummy, jamminess.