much prefer to par boil then oven.
I do similar, got it totally nailed now for healthy chips:
Chuck 300g of sliced potato's (about 5-8mm thick), in the microwave for 4.5mins, no added water. Then rinse/ wash them to get shot of the starch, dry them in a metal colander in the oven for 2 mins.
Give a baking tray a sprays of oil, brush around, sprinkle some peri peri salt on the tray, spread the dried chips out on top, bit more peri peri salt on top and then bake for 20-25mins, unreal, every time.