from my past experience, using redx in the seventies, you could tell was getting used as it made the exhaust smell and smoke. with 2 stroke oil on scooters ridden by slower riders tended to gum up, the engine needs to rev higher to burn off as in 2 stroke motocross and race bikes. The need for plug chops on race bikes took place to check how the fuel was burning , slower riding back to pits gave a false reading.
On the T100 I used an additive/lead substitute, as I didnt ride it much I found it gummed up the carb and now have 15 litres in a can of fuel that is green and too thick for the jets. Castrol R was always difficult as if not burnt off lacquered the fuel system, but on a race bike, speedway, road or mx went fast and hot enough to burn off.
I would suggest , if using 2 stroke oil in fuel, jets might have to increase in size as Ive found ethanol fuel clogs the carbs if not being used and being a classic road bike it may not get hot enough to burn off.