How to make real crisp French fries?

I can cook anything, except french fries. I think they are the hardest thing there is to cook. I have tried everything. Russet potatoes, blanching them, triple frying, peanut oil, putting on the fridge for 30 mins, boiling, crisco shortening, warm water with sugar... I am sick of reading the same bs over and over. There is a secret to making restaurant french fries and I want to know, if you are a restaurant chef or a cook, please tell me.