I will throw somethng in here on the low end. many use it and works well. It's for getting the low end set right. You have to be careful though. There are back up checks to see if the adjustments you made had an effect, wheter good or bad. That pinch test n the high end is one of them. For the low end, do this,

While the engine is at an idle, either remove the fuel line from the carb or pinch it closed until the engine quits running. Trick is to listen to the rpms as the engine dies. If the rpms increase and then go down and quit. your low end is too rich. If the rpms just go down and quit-too lean. I usually set mine at a very slight increase. I rarely change my low end in any single weather season.

Have not had a deadstick in several years due to tuning issues.