Wow, 20% is different. Theres no way I could fly like that with the throws I have. I am so used to moving my sticks fast and lots of movement. 20% would get me into trouble.

That reminds me of when I did a maiden flight on my Shrike and had the expo way to low. From the second it left my friends hand it was over correcting over and over again. That was nuts, luckily I managed to bring it back down and adjust more expo.

I usually fly at around 60% expo on ailerons 45 - 50% on elevator and 10% on rudder. This is pretty much what I use on all planes except a Diamond Dust I had. On that one I had 95% expo on elevons but that was a different type plane.

But like everyone said personal preference. What ever stick movement your used to depends on the amount of expo. A little tweaking here and there and you should have a nice set up.