I decided to change the stock motor setup for have more flight time with the FPV equipment and the GoPro ! So this my new motorisation :
Motor : Turnigy D2830/11 1000kv
ESC : Turnigy Plush 30A
Prop : Graupner Elektro Prop 8x5
Lipo : 4s 3300mAh for 25~30min with GoPro and OSD
Rx : L9R Frsky
OSD : Remzibi OSD
Vtx : 5.8GHz 600mW ImmersionRC
Vtx antenna : Spironet ImmersionRC/Fatshark
Camera : 600TVL Fatshark