one thing to keep in mind, if you keep getting the same results you are never going to solve it by repeating the equasion. I have had luck getting through a hard spot by altering the point split to get less bite all at once and add some back cut.....alow down and add oil. you may chip a bit trying to get through, but once making a pull again, it will machine well. I have done a lot with little by trying several ways out of the mess I am in.
