Tank busting only works for the HurriD and StukaG, otherwise the low and slow approach of IL-2s and HS-129 simply will be shot down by tank cannons all day long.
I'd rather stick to flying an A-20 and dive bombing, although its far more fun to annoy tankers by flying an Il-2 around, when they track you - simply let the country men know and they can sneak up on the tanks, turret turns away - blast them.
Can be rewarding either way.