Congratulations on taking on short sales.
I took the CDPE course a number of years ago and I subscribe to their website. It is chucked full of information and other agents handling short sales. Also, AR and Short Sale Superstars as has already been mentioned.
I personally have not experienced any problems in changing forms. I submit the same package each time and have not encountered anything missing. Another helpful hint..........I use the small Avery labels and I print out a page or two for each file including the seller's name, address and account number. It helps when it gets to the other end. If they set down a paper, it is easily found and put back with the correct file.