No, I mean THE 15° angle: https://imgur.com/qslleAf
I saw your thread on facebook prusa group and I've no idea why you call 20° angle 70°. You from USA or something?
Anyway, got up to 15° with STOCK MK3 cooler.
And by blowing air on the nozzle, I mean it sits bit higher than stock shroud and blows more air on the nozzle than on the filament.