Purchased a 2013 560C last fall (same as 9560). Excited to give the new machine a go. Wondering what a guy can do before we even hit the field to improve sample quality, as I’ve done lots of reading and have heard that grain sample can be a bit of an issue on these machines. Found lots of threads mentioning a plastic pre-cleaner instead of the OEM one and a pre-cleaner extension? Are these worth installing? Any other tips? We grow durum, canola, canary seed, lentils and barley. The machine already has an airfoil chaffer (was in when we bought it) Any input is appreciated.