Glad to hear the OP got an answer that seems reasonable.
I know that we mostly focus on EC261 compensation here for IDB, but I thought it was worth mentioning for posterity that US regulations could also have applied given the flight originated at JFK.
Basically an IDB resulting in a delay over 1 hour is entitled to a maximum of $650 or 200% of the fare paid, and over 4 hours is $1300 or 400%. In the case of an award ticket, the cash calculation is based in the lowest cash fare paid for that class of service (I would argue it should be changed to highest, but I'm getting further off topic). For paid tickets EC261 is perhaps more favorable for an IDB claim, but for an award ticket, the US regulations are probably better if you want cash instead of avios.
http://airconsumer.ost.dot.gov/publications/flyrights.htm#overbooking has more details.