Which unless you have priceless frescos on the interior wall is a damn sight easier to repair than external stonework exploded to smithereens. Blowout on common brickwork looks crap too and just like the stonework the craters are usually bodged with half a tube of clear mastic, but by the time there is half a wok on the side of the house who really gives a toss about the exterior state of the building?
Then ease off on the pressure and let the drill do the work. If a
10mm drill is lifting 12 inches diameter of plaster then something is seriously wrong with either the technique or the plaster.Maybe slightly but 99% of the time it makes sod all difference.
Errm, no. Unless you start unusually high up on the wall drilling from the inside pointing down as you suggested runs the risk of penetrating the damp course. Drilling from the outside heading up eliminates most of that risk.