The polisher is currently on its way to Rupes USA for examination and possibly repair. I spoke to someone named Will on the phone who was very helpful. They need to feel it first-hand to know if it's normal or not but they seemed to think it should be a smooth trigger pull. Will also seemed to suggest that even if it is normal when it's apart they will look at it and try to make it feel right for me. Here's hoping it's a quick and satisfactory process.
Edit: In parallel my wife requested to return the tool through Amazon. Even as of today detailersdomain has not responded to the Amazon return request. I'm surprised because I've met Phil and I thought he ran a top notch operation.