I have an original Ultimaker (DIY Kit). The Reason why I have only 85% is that the Surface is much smoother with this Setting than with 100%. I also use less on the first Layer because the Pressure is less on the Nozzle and I dont get "Elephant Foots" on my Prints.This is my Experience with my UM. When the Amount of Plastic is as exact as possible, the Prints come out much better.
After my Changes, the Prints cone out perfect. It was just because I installed another (newer) Version of Cura (15RC5) and there was somethig left from an older Version which made this Trouble. Uninstalling the old and only working with the newest fixed my Problems.