Your screen artefacts can be caused by shortage of power from your stock power supply adapter.
Firmware(with kernel included) from first page has lower power consumption due to the lower CPU/GPU/DDR speed adjustment.
d33's kernels require a little bit more power because they have higher clocks.
Just try to use another PS(at least 5V/3A) and I can bet your artefacts go away(my bet is 75% against somebody's 25%

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