I downloaded the 20171011 and installed it locally. It puts me on the phone that I have the 20170412. I continue with the base band p26 instead of the p27, the kernel also did not change it. I have 3.18.35
I flashed with a computer. Maybe that explains the difference? Sometimes a local flash is not effective, check under settings/about/wireless updates to see actual version. (The settings/about/version is also usually wrong)
I already recalibrated. By engineering menu and developer menu no improvement.I think its hardware fault not software issue. Black view doesn't have any answer for this issue.