cemos advisor app
the "cemos advisor" app is a great tool to help with machine settings and measuring crop loss. you simply enter the machine/head combo the crop your harvesting and it will tell you kernels on the ground for accurate loss.
remember with losses to walk behind head to get accurate header loss before figuring combine loss.
it also has a page for settings. if having an issue you pick your setup and crop then pick a symptom. like kernel on the cob. it might say to close concave 2mm. you do it if it helps you say yes. if it didn't help you tell it no. it will then tell you another thing to try. you just keep following the prompts until you have a satisfactory grain sample.