I use a bumper case and have used both TPU and aluminium, but I cannot recommend them for more than light protection. Yeah, I've dropped my phone once or twice in the last year or so (S3) but I'd not have had terribly high hopes that it would have survived being dropped from ear height with any of the bumpers I've used unless it had the luck of falling on some very soft grass.
I don't know if the DRACO bumpers exhibit enough difference in alloy to not do so, but the one I had only offered protection by simply deforming as aluminium is want to do as it is such a soft metal. I lost a chunk out of the corner and it was also a pain to take on and off. It also basically directly transferred the shock to the phone so I'm lucky it didn't outright break because of that. Unless someone has compelling evidence I would consider them a fashion item, not for protection (when it comes to someone who is likely to drop their phone more than once or twice a year and who doesn't want dents and scratches all over the super sleek and shiny bumper).
I find it curious that the silicone shell on yours is deforming so much, I used a 100% silicone case for a couple months at one point and it's still in good, non-deformed condition. Maybe try a different model or company that offers equal protection ? (I know there were other "heavy duty" cases for the S3 other than the Otterbox)
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