Found an interesting link today from WDW Prep School.
http://www.thedibb.co.uk/forums/showpost.php?p=10123554&postcount=1
The site claims that it is showing a constantly refreshed view into FPP availability for the most popular rides. It uses a party of 4 as it’s base so if you are less or more than that it could be different results. Worth trying if you are having trouble with FPP’s. I do not make any claim to it’s accuracy though.