I was just on the TWRP git and looked at your BoardConfig.mk file, one thing I notices is that it flags the display as 800x1280. Shouldn't this be 1080x1920?
# TWRP specific build flags
DEVICE_RESOLUTION := 800x1280
TW_INCLUDE_DUMLOCK := true
RECOVERY_SDCARD_ON_DATA := true
BOARD_HAS_NO_REAL_SDCARD := true
TW_INTERNAL_STORAGE_PATH := "/data/media"
TW_INTERNAL_STORAGE_MOUNT_POINT := "data"
TW_NO_USB_STORAGE := true
RECOVERY_GRAPHICS_USE_LINELENGTH := true
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