You've been on this board for a long time - and you don't remember the easiest way to determine whether you have a fuel problem or it's something else - like ignition, timing, or even mechanical?
It not only will help you decide if it's a lack of fuel, among other things, it'll help determine whether the mixture is right or not - at all speeds.
I'm sure you've seen me suggest it to others lots of times, and seen their feedback about how quick and easy it was. Even magazines are quoting my article.
But maybe it's the small cost ($8-10) of making the tool is too insignificant to buying lots of parts to throw at it playing "hit or miss?"