There is a LOT of misinformation in this thread.
Having attended many OPE manufacturer's service schools, and becoming Echo certified in 2-cycle engine failure analysis, let me share a little of what I learned...
1st, the equipment manufacturer determines the mix ratio used in their 2-cycle engines. They engineered and tested their engines, so they know what the engines need.
2nd, the 2-cycle oil being used must be the correct oil for the equipment at the manufacturer's specified mix ratio. In other words, if the manufacturer's specified mix ratio is 50:1, the oil should specify that it is for use at 50:1 on the label, and the oil must be mixed at 50:1, even if it says it can be used at "up to" 100:1 on the label. If the oil says 40:1 on the label it should not be mixed and used at 50:1. If the oil says 100:1 on the label it should not be used at a 100:1 ratio in a 2-cycle engine whose manufacturer has specified 50:1 regardless of what the oil company "claims" on the label.
3rd, the 2-cycle oil being used must be TCW3 certified for water cooled 2-cycle engines, or JASO certified for air cooled 2-cycle engines. If the oil says it can be used in both, it shouldn't be used in either.
It is your equipment so you can do what you want, but, in my experience if you follow the above rules you won't have any lubrication related engine failures (I never saw one during all the years that I was working on them).
Lacking an accurate small engine tachometer (which is how the manufacturers want you to adjust the carburetors now days), after the engine is warm and the low speed mixture has been adjusted at idle, the correct way to adjust the carburetor's high speed mixture is to richen it (turn the high speed mixture screw OUT) just enough so the engine 4-cycles slightly at full throttle with no load. At full load (like on a blower), at full throttle richen it up until it 4-cycles, and then lean it out (turn the high speed mixture screw IN) just enough that it runs smooth (and not any further). It is hard to describe the 4-cycling sound on paper other than "raspy".