Best thing for long uniform frys are those heavy duty potato smasher things that you mount on a 2x4 like out in your garage. You place whole potato upright in it, bring down the handle and the frys fall into a basket you have hanging underneath it. A professional item that can only be bought at places that sell camping supplies like Bass pro, etc.
have to have some arm power to bring down the handle to split the potato into frys, but, well worth it. I caught on to this when I was at a fund raiser cook out and saw the guy using one asked where he bought it, told me cost around 100 think it was, but, will last forever and the only one you will ever buy. Maybe I can upload a picture.