classic mac crt from rapsberry pi 4

Made some progress driving the Mac CRT from the Raspberry Pi 4 with MiniVMac running MacSE emulation. The color "mixing" down to B/W works pretty well. The most curious thing I'm seeing is that one pixel squiggle back and forth on vertical lines each scan line. Its kind of crazy to run the emulator in fast mode. Its like the fastest classic mac you've ever seem https://www.facebook.com/groups/644418325623804/?multi_permalinks=6285890194809894&hoisted_section_header_type=recently_seen