I use no D/R or Expo on my wirdbirds and sport plane..but with 3D planes, I need at least 50% in Expo to smooth out the flight, especially for harrier, hover and rolling harrier. Expo setting is kind of personal preference, I found it doesn't really matter for small/slow foamie planes since you have tons of time to react. but for larger 3D plane like the 43" Yak, Swift, Tempo or balsa planes (minimum 300W+ output with large control surfaces), my fingers are too heavy for most of the time. What is the AUW on your Venus? I am think about indoor flying for the winter.