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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.

Proof: https://imgur.com/8iMFlCZ
Stl: https://www.thingiverse.com/thing:2298057

Overhang Test