If you aren't happy with their offer on the bike, you can always demand they find another in comparable condition, etc and put it on your driveway, at which point you'll give them the keys and sign over the title to the wrecked bike. That forced them to not only look at KBB, but to look at classifieds (cycle trader, etc) and fix a value based upon those numbers.
I negotiated that way after a wreck and got a much better offer for the bike. In my case it was all cosmetic damage (Ducati so $$$ plastics) after agreeing on a $#### for the bike, I bought it back(25% maybe?) and got her back on the road. I also refused to let them take it out of my garage until we had settled on a number, they offered to send out a truck to pick it up every time we talked.
Sorry you went down, but good luck getting things resolved!
1978 Kawi ke175 (Green)
1983 Yamaha rz350 (White)
2013 Yamaha Super Tenere (White)