The ratio is something you are going to have to play with to get the way you like. I don't think there is really a set amount, only a general recommendation as for a starting point. What I did was put in just a little flaperons to go along with the elevator. How much I can't remember. I could check this evening on my radio. But, if I hadn't gotten the result I'd wanted then I would've bumped up the flaperons a couple of percent more and see what happened. What radio are you using avngr1?