Concerning the DX6i: if you fly both acro and heli, make two different radio setups in your DX6i and PhoenixRC. One DX6i setup in heli mode and one in acro mode. As the flaps switch does not work correct for planes if your DX6i is in Heli mode. Furthermore do note that you'll need two calibration setups (which you only use for calibration in PhoenixRC) in your DX6i, heli and acro one. As the DX6i uses different channels in heli and acro mode.