Tom, it's a simple process. Here it is laid out orderly for you.
Is the home showing deferred maintenance?
Has the home been damaged?
Is the systems in the home at end-of-life?
What do the comps indicate?
What is your ARV calculation?
Who owns the mortgage?
When was the mortgage granted? (a 2001 mortgage is quite different than a 2006 mortgage)
How many lenders exist?
How for into the foreclosure process is the home?
Has the home been pre-approved for a short sale prior to your interest?
Is the owner in default at this time?
How was the listing price reached?
How long has the home been listed for sale?
Has the owner truly committed to selling the home?
Do you know their end game?
Who is going to engage the bank or their surrogate?
Make offer based on historic value bracket of that lender that coincides with the time in which the lender will be evaluating your offer. Some will evaluate in 30 days, others can take longer that 6 months.
Without a bit of research you are truly flying blind.
"% of short sale" reflects you are attempting to match a short sale with conventions that apply to traditional sales. That, you will discover, will not serve you well. Your focus is on the wrong subject and with the wrong intent.
Best of success in buying your Florida real estate