Metal, thanks again for the legwork! It's great when someone takes control.
I have one suggestion - you can take it or ignore it, since you've already done this much work already and I don't want to give you more, but you have the contacts already.
You might want to call the Residence at 17th and tell them that many reservations will be pulling out, since you have a price of $135 / nt for your group at Techwood. They might laugh, or it might be enough leverage to get a (reasonable) group rate from them as well. I won't pay $230+ / nt to stay at the Res., but I might pay $10 or $20 more per night to be closer to the arena.
Just a thought - ignore or follow through. Either way, thanks for organizing this!
Steve in Philly