I make potato pancakes with 5 potatoes also - the food processor makes quick work of them! I also layer them in a bowl between papertowels as i take them out if the processor. This dries them and might be helping to avoid the ‘pinking’ - i haven’t seen it happen yet!
Well, I made potato kugel which is more casserole than pancakes. Given the long baking time (2 hours) it needs much more moisture than latkes.
One of my troubles is that I don’t know how to use the dicing/slicing disc on my food processor!