With those claims, I don't know who can help you, but I've been very happy with Buckner (
The Buckner Company | Insurance, Employee Benefits and Surety Bonds) over the last five years. We were with OOIDA before that and they were ridiculously expensive and offered a substandard product.
If you're a NASTC member, they might be an option for you. They tried getting me to switch a couple years ago and were around $50 - $100 under what I was paying Buckner, but I'm too happy with the service I get from Buckner to ditch them for a mere $100.
Good luck.
Oh, if you call Buckner, ask for Kim Russell... she's awesome.