Short Sales are so involved, that I could go on for hours about them. Feel free to contact me directly if you have any further questions. I believe one of our key functions as Realtors is to continue to enhance our knowledge of the current real estate environment, and I'm more then happy to pass any knowledge I have along to the public and my colleges.
Not knowing all the particulars to your situation, generally speaking if you are having a hard time it is probably because of the third party (bank). Even though the seller has listed at a given price, the bank must approve the sale and price depending on what the sellers owe the bank and what is to be done with those monies. (Pay the bank, have the bank forgive, or?) Another problem we see is that banks are not the easiest to get ahold of, especially if they are based on the east coast. If you have an agent trying to get thru to them on westcoast time, they have limited their ability to talk with them. In our office, if dealing with east coast banks, we are getting up and calling at 6AM and completing those calls by 9AM.
The other problem may be in the type loan you have been approved for and/or the offer. If you are asking for all escrow fees and inspections to be paid by the seller, your chances are limited. Most banks will only pay the normal split of fees paid by the seller. I am not saying it can't be done, but again more difficult and not always successful.
My suggestion would be to make sure you are working with a buyers agent (not the listing agent) and ideally one that is experienced in short sales. They do take more time, but if you can hang in there you can get some great deals.