you should heat it up as well as using the impact, cuz i used just an impact as i didnt know it had loctite on it, and it turned the phillips head into a double phillips head, the bit tore the screw a new one. so with heat and an impact it will back out nicely.
As you say, the air impact is too fast. I wouldn't say too powerful just because you need so much stinking power to get these suckers loose, but the screwdriver I posted up top only advances about 1/4 turn every time you hit it, which means it breaks the bolts loose, and doesn't keep spinning like the air impact, messing up the heads. I got mine off no marring...
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