Have you tried Kanthal builds? My screen is pretty stable when using nickel, but kanthal builds I can reproduce the glitching every time. For a .05 ohm kanthal build it will glitch somewhere in the 20-29 watt range. Usually in or around 25-28 watts. On a 1.2 ohm kanthal build it will glitch in the 30-39 watt range. Sometimes it does not show on the first fire, so 4-5 fires on each single watt increment is a good way to test as you work your way up.
I don't build coils..... in non temp mode I use manufactured non-nickel coils in tanks and also carto tanks.... nothing seen there either.... the one quick screen refresh was in TP mode...
I guess you got yours to change the screen from right to left and go into stealth mode.... you said it would not do this earlier. Just wondering.