Zoebisch is right, the right potato makes all of the difference. A faculty member in my Dept. breeds potatoes (emphasis on disease resistance) and has an automated chip processesing machine. You have to make sure the disease resistant potato also tastes good. A couple of years ago we had a potato chip day and got the low down on chip making, from the potato side, not the cooking side. The chip makers use only fresh potatoes for 9 months of the year. The prime chip potato does not store very well (compared to others as far as maintaining suitability for chip making). The season starts with fresh potatoes coming in from Florida and the follows the harvest North up through Maine as the potatoes mature. During the time between the last potato harvest in the Fall and the first in the Spring, the chip manufacturers use a different potato variety (blanking on the name) that stores better, but doesn't have as good of a flavor.
We had available for tasting VERY fresh chips made with both varieties and there was a definite difference in the taste of the two