OP, I wish you well in your quest to be made whole and hope it is as painless as possible. Clearly you are very sharp and don't need to be told this, even so, a reminder is in order when stuff like this happens. Insurance companies are masters at minimizing their expenses, while maximizing their income. Most of us don't deal with insurance claims on a regular basis and are generally unaware on how we get shortchanged.
From imported, substandard chrome bumpers not even strong enough to stand on, to gallons of body filler or re-skined doors that corrode within a year, or the failure to cover the taxes, registration and title costs of a replacement vehicle. Insurance companies have untold clever methods of managing the situation. Don't let them get away with it, I suggest a lawyer, as you may never be made whole otherwise.
I recently hit a curb in the median with a rental Jeep Grand Cherokee on a biz trip. Hertz charged me $22K for the damages. Damaged tire, wheel, ball joint. My insurance did not cover the entirety and there was nothing I could do to get them to pay. Their policy does not cover "administrative costs" or "loss of use" charges. I should have lawyered-up immediately. My company also refused to pay, so Hertz holds me responsible and placed this on my credit. I'm not paying.