Using a Power Pressure Cooker XL for high altitude canning above 6000 ft sea level

I just purchased a Power Pressure Cooker XL and was planning on using it for canning. However, upon reading the owners manual, it says it is not recommended for canning over 2,000 ft sea level. I live at 6611 ft above sea level. Can I use this machine as long as I increase my cooking time by 5% per extra 1,000 feet above 2,000 ft? Or should I purchase something different to use for both home cooking & canning. Thank you.