This isn't good enough. I encourage you to pursue this, as a paying customer. Be polite, respectful, and persistent! I am a very patient and forgiving customer, but really for $300...consider you paid for a GOOD working product, you deserve that, and likely an extension to your contract. My replacement came in and was a LOT worse than the first one (oddly enough, the reception (signal) was worse too. I had this issue with my first Treo, the screen was tilted maybe 1 degree. And when I asked if I was being OCD, the store clerk seemed annoyed, but told me "I'd never be able to deal with staring at that every day" and we went through 3 and got a good one. I'm a lot of things, but OCD isn't one of them.
The store I went to with my Razr, needed honest proof, so we visited the closet, and now agrees they are likely from glue used in the manufacturing process. And as you said, Motorola seems to say they are "part of the normal manufacturing process" and yet why does it exist on ALL Droid Razr models (Currently there are 4) and not other moto models (or other brands?). Hmmm... I found very little online where other brands have had the same issue on ALL units in a run.
Ouch. Regardless, if this is the case, sending it back for another and another won't help.
Unless enough customers complain, they (Moto) may not listen. True, posting in user (only) forums won't get their attention. I was curious if anyone else has tried to contact them? My one replacement so far was a LOT worse than the original, but if other brands don't have this issue, well...and to pay $300 for it...
Maybe we need to get VeriZon, as they are the largest (only?) US Razr customer into the fray; THAT would get action.