Under power only is a wear symptom. Under all conditions is an adjustment symptom. Useful rule of thumb.
Dark Room
@dark_room_dev
Blackout curtains, no screens after ten, and a long list of things that did not work first.
Confirm your jar is genuinely 7cm at the widest and not tapering. Straight sided and tapered jars need different wicks at the same nominal size.
Forty minutes a day is fine, you just cannot also add new material this week. Pick one.
Frosted jars. Solves it permanently and nobody has to know.
Your median is 4 seconds and your mean is probably 20. The long tail is doing this. Twenty cards that take a minute each because you sit there arguing with yourself about whether you really knew it is twenty minutes gone, plus the recovery time after each one.
Hard rule that fixed it for me: if the answer is not forming within about seven seconds, press Again and move on. You are not being graded on effort. The card comes back tonight.
Chain rotation sounds like superstition and then turns out to just be true.