If MSRP is $75,155 and the dealer took off $2,983.96, your selling price is $72,171 before $2,500 spring credit. That means they are selling you the car for $3k over invoice of $69.2k. This is a terrible deal to be honest.
As the 2011s already arrived to dealer lot, I don't see why you can't get them to sell the car @ invoice, which is $69.2k before $2,500 credit and any downpayment.
In other word, you should be able to pay the same monthly without any down payment at all. If you really wanted to reduce the amount further, consider putting down multiple security deposits, which will drop your monthly by another $50/mo.