Mashed Potatoes Are Gluey

I make small batches of mashed potatoes for potato pancakes from Yukon Gold potatoes. I like them with the peels, so I quarter and boil them with salt, then drain and cool them in the walk-in. To break up the skin, I process them in small batches in the food processor. We don't have a mixer, it broke and isn't fixed yet.

Sometimes this works just fine, and I get fluffy mashed potatoes. Other times, with a very short processing time, they turn gluey. Sometimes they even make a glutenous...

Mashed Potatoes Are Gluey