the problem you hsve adding flaperons on the plane in question os that they are out at the tips and when you lower them you are basically adding washin at the tips.while they will generate more lift it is only at the outboard end of the wing and if you do stall there will be no way to recover.you have been given good advice from those thar know but accept the advice from someone still experminting with them because it is whjat you want to hear.check the warbird or arf forum for flight problems and tips.